PHPOffice /
PhpSpreadsheet
| Total Complexity | 44 |
| Total Lines | 625 |
| Duplicated Lines | 0 % |
| Coverage | 78.56% |
| Changes | 0 | ||
Complex classes like Database often do a lot of different things. To break such a class down, we need to identify a cohesive component within that class. A common approach to find such a component is to look for fields/methods that share the same prefixes, or suffixes.
Once you have determined the fields that belong together, you can apply the Extract Class refactoring. If the component makes sense as a sub-class, Extract Subclass is also a candidate, and is often faster.
While breaking up the class, it is a good idea to analyze how other classes use Database, and based on these observations, apply Extract Interface, too.
| 1 | <?php |
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| 5 | class Database |
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| 6 | { |
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| 7 | /** |
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| 8 | * fieldExtract. |
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| 9 | * |
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| 10 | * Extracts the column ID to use for the data field. |
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| 11 | * |
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| 12 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 13 | * A database is a list of related data in which rows of related |
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| 14 | * information are records, and columns of data are fields. The |
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| 15 | * first row of the list contains labels for each column. |
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| 16 | * @param mixed $field Indicates which column is used in the function. Enter the |
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| 17 | * column label enclosed between double quotation marks, such as |
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| 18 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 19 | * represents the position of the column within the list: 1 for |
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| 20 | * the first column, 2 for the second column, and so on. |
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| 21 | * |
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| 22 | * @return null|string |
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| 23 | */ |
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| 24 | 10 | private static function fieldExtract($database, $field) |
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| 25 | { |
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| 26 | 10 | $field = strtoupper(Functions::flattenSingleValue($field)); |
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| 27 | 10 | $fieldNames = array_map('strtoupper', array_shift($database)); |
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| 28 | |||
| 29 | 10 | if (is_numeric($field)) { |
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| 30 | 8 | $keys = array_keys($fieldNames); |
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| 31 | |||
| 32 | 8 | return $keys[$field - 1]; |
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| 33 | } |
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| 34 | 10 | $key = array_search($field, $fieldNames); |
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| 35 | |||
| 36 | 10 | return ($key) ? $key : null; |
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| 37 | } |
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| 38 | |||
| 39 | /** |
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| 40 | * filter. |
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| 41 | * |
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| 42 | * Parses the selection criteria, extracts the database rows that match those criteria, and |
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| 43 | * returns that subset of rows. |
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| 44 | * |
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| 45 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 46 | * A database is a list of related data in which rows of related |
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| 47 | * information are records, and columns of data are fields. The |
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| 48 | * first row of the list contains labels for each column. |
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| 49 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 50 | * You can use any range for the criteria argument, as long as it |
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| 51 | * includes at least one column label and at least one cell below |
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| 52 | * the column label in which you specify a condition for the |
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| 53 | * column. |
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| 54 | * |
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| 55 | * @return array of mixed |
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| 56 | */ |
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| 57 | 10 | private static function filter($database, $criteria) |
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| 58 | { |
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| 59 | 10 | $fieldNames = array_shift($database); |
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| 60 | 10 | $criteriaNames = array_shift($criteria); |
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| 61 | |||
| 62 | // Convert the criteria into a set of AND/OR conditions with [:placeholders] |
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| 63 | 10 | $testConditions = $testValues = []; |
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| 64 | 10 | $testConditionsCount = 0; |
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| 65 | 10 | foreach ($criteriaNames as $key => $criteriaName) { |
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| 66 | 10 | $testCondition = []; |
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| 67 | 10 | $testConditionCount = 0; |
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| 68 | 10 | foreach ($criteria as $row => $criterion) { |
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| 69 | 10 | if ($criterion[$key] > '') { |
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| 70 | 10 | $testCondition[] = '[:' . $criteriaName . ']' . Functions::ifCondition($criterion[$key]); |
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| 71 | 10 | ++$testConditionCount; |
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| 72 | } |
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| 73 | } |
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| 74 | 10 | if ($testConditionCount > 1) { |
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| 75 | 8 | $testConditions[] = 'OR(' . implode(',', $testCondition) . ')'; |
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| 76 | 8 | ++$testConditionsCount; |
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| 77 | 6 | } elseif ($testConditionCount == 1) { |
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| 78 | 6 | $testConditions[] = $testCondition[0]; |
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| 79 | 10 | ++$testConditionsCount; |
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| 80 | } |
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| 81 | } |
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| 82 | |||
| 83 | 10 | if ($testConditionsCount > 1) { |
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| 84 | 6 | $testConditionSet = 'AND(' . implode(',', $testConditions) . ')'; |
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| 85 | 8 | } elseif ($testConditionsCount == 1) { |
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| 86 | 8 | $testConditionSet = $testConditions[0]; |
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| 87 | } |
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| 88 | |||
| 89 | // Loop through each row of the database |
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| 90 | 10 | foreach ($database as $dataRow => $dataValues) { |
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| 91 | // Substitute actual values from the database row for our [:placeholders] |
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| 92 | 10 | $testConditionList = $testConditionSet; |
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| 93 | 10 | foreach ($criteriaNames as $key => $criteriaName) { |
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| 94 | 10 | $k = array_search($criteriaName, $fieldNames); |
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| 95 | 10 | if (isset($dataValues[$k])) { |
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| 96 | 10 | $dataValue = $dataValues[$k]; |
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| 97 | 10 | $dataValue = (is_string($dataValue)) ? Calculation::wrapResult(strtoupper($dataValue)) : $dataValue; |
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| 98 | 10 | $testConditionList = str_replace('[:' . $criteriaName . ']', $dataValue, $testConditionList); |
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| 99 | } |
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| 100 | } |
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| 101 | // evaluate the criteria against the row data |
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| 102 | 10 | $result = Calculation::getInstance()->_calculateFormulaValue('=' . $testConditionList); |
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| 103 | // If the row failed to meet the criteria, remove it from the database |
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| 104 | 10 | if (!$result) { |
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| 105 | 10 | unset($database[$dataRow]); |
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| 106 | } |
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| 107 | } |
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| 108 | |||
| 109 | 10 | return $database; |
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| 110 | } |
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| 111 | |||
| 112 | 10 | private static function getFilteredColumn($database, $field, $criteria) |
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| 113 | { |
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| 114 | // reduce the database to a set of rows that match all the criteria |
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| 115 | 10 | $database = self::filter($database, $criteria); |
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| 116 | // extract an array of values for the requested column |
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| 117 | 10 | $colData = []; |
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| 118 | 10 | foreach ($database as $row) { |
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| 119 | 10 | $colData[] = $row[$field]; |
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| 120 | } |
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| 121 | |||
| 122 | 10 | return $colData; |
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| 123 | } |
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| 124 | |||
| 125 | /** |
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| 126 | * DAVERAGE. |
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| 127 | * |
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| 128 | * Averages the values in a column of a list or database that match conditions you specify. |
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| 129 | * |
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| 130 | * Excel Function: |
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| 131 | * DAVERAGE(database,field,criteria) |
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| 132 | * |
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| 133 | * @category Database Functions |
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| 134 | * |
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| 135 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 136 | * A database is a list of related data in which rows of related |
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| 137 | * information are records, and columns of data are fields. The |
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| 138 | * first row of the list contains labels for each column. |
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| 139 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 140 | * column label enclosed between double quotation marks, such as |
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| 141 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 142 | * represents the position of the column within the list: 1 for |
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| 143 | * the first column, 2 for the second column, and so on. |
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| 144 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 145 | * You can use any range for the criteria argument, as long as it |
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| 146 | * includes at least one column label and at least one cell below |
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| 147 | * the column label in which you specify a condition for the |
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| 148 | * column. |
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| 149 | * |
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| 150 | * @return float |
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| 151 | */ |
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| 152 | 1 | public static function DAVERAGE($database, $field, $criteria) |
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| 153 | { |
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| 154 | 1 | $field = self::fieldExtract($database, $field); |
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| 155 | 1 | if ($field === null) { |
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| 156 | return null; |
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| 157 | } |
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| 158 | |||
| 159 | // Return |
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| 160 | 1 | return Statistical::AVERAGE( |
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| 161 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 162 | ); |
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| 163 | } |
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| 164 | |||
| 165 | /** |
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| 166 | * DCOUNT. |
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| 167 | * |
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| 168 | * Counts the cells that contain numbers in a column of a list or database that match conditions |
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| 169 | * that you specify. |
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| 170 | * |
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| 171 | * Excel Function: |
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| 172 | * DCOUNT(database,[field],criteria) |
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| 173 | * |
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| 174 | * Excel Function: |
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| 175 | * DAVERAGE(database,field,criteria) |
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| 176 | * |
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| 177 | * @category Database Functions |
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| 178 | * |
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| 179 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 180 | * A database is a list of related data in which rows of related |
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| 181 | * information are records, and columns of data are fields. The |
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| 182 | * first row of the list contains labels for each column. |
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| 183 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 184 | * column label enclosed between double quotation marks, such as |
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| 185 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 186 | * represents the position of the column within the list: 1 for |
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| 187 | * the first column, 2 for the second column, and so on. |
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| 188 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 189 | * You can use any range for the criteria argument, as long as it |
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| 190 | * includes at least one column label and at least one cell below |
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| 191 | * the column label in which you specify a condition for the |
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| 192 | * column. |
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| 193 | * |
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| 194 | * @return int |
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| 195 | * |
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| 196 | * @TODO The field argument is optional. If field is omitted, DCOUNT counts all records in the |
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| 197 | * database that match the criteria. |
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| 198 | */ |
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| 199 | 1 | public static function DCOUNT($database, $field, $criteria) |
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| 200 | { |
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| 201 | 1 | $field = self::fieldExtract($database, $field); |
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| 202 | 1 | if ($field === null) { |
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| 203 | return null; |
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| 204 | } |
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| 205 | |||
| 206 | // Return |
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| 207 | 1 | return Statistical::COUNT( |
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| 208 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 209 | ); |
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| 210 | } |
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| 211 | |||
| 212 | /** |
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| 213 | * DCOUNTA. |
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| 214 | * |
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| 215 | * Counts the nonblank cells in a column of a list or database that match conditions that you specify. |
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| 216 | * |
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| 217 | * Excel Function: |
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| 218 | * DCOUNTA(database,[field],criteria) |
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| 219 | * |
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| 220 | * @category Database Functions |
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| 221 | * |
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| 222 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 223 | * A database is a list of related data in which rows of related |
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| 224 | * information are records, and columns of data are fields. The |
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| 225 | * first row of the list contains labels for each column. |
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| 226 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 227 | * column label enclosed between double quotation marks, such as |
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| 228 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 229 | * represents the position of the column within the list: 1 for |
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| 230 | * the first column, 2 for the second column, and so on. |
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| 231 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 232 | * You can use any range for the criteria argument, as long as it |
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| 233 | * includes at least one column label and at least one cell below |
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| 234 | * the column label in which you specify a condition for the |
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| 235 | * column. |
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| 236 | * |
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| 237 | * @return int |
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| 238 | * |
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| 239 | * @TODO The field argument is optional. If field is omitted, DCOUNTA counts all records in the |
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| 240 | * database that match the criteria. |
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| 241 | */ |
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| 242 | public static function DCOUNTA($database, $field, $criteria) |
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| 243 | { |
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| 244 | $field = self::fieldExtract($database, $field); |
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| 245 | if ($field === null) { |
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| 246 | return null; |
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| 247 | } |
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| 248 | |||
| 249 | // reduce the database to a set of rows that match all the criteria |
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| 250 | $database = self::filter($database, $criteria); |
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| 251 | // extract an array of values for the requested column |
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| 252 | $colData = []; |
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| 253 | foreach ($database as $row) { |
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| 254 | $colData[] = $row[$field]; |
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| 255 | } |
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| 256 | |||
| 257 | // Return |
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| 258 | return Statistical::COUNTA( |
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| 259 | self::getFilteredColumn($database, $field, $criteria) |
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| 260 | ); |
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| 261 | } |
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| 262 | |||
| 263 | /** |
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| 264 | * DGET. |
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| 265 | * |
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| 266 | * Extracts a single value from a column of a list or database that matches conditions that you |
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| 267 | * specify. |
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| 268 | * |
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| 269 | * Excel Function: |
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| 270 | * DGET(database,field,criteria) |
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| 271 | * |
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| 272 | * @category Database Functions |
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| 273 | * |
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| 274 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 275 | * A database is a list of related data in which rows of related |
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| 276 | * information are records, and columns of data are fields. The |
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| 277 | * first row of the list contains labels for each column. |
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| 278 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 279 | * column label enclosed between double quotation marks, such as |
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| 280 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 281 | * represents the position of the column within the list: 1 for |
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| 282 | * the first column, 2 for the second column, and so on. |
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| 283 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 284 | * You can use any range for the criteria argument, as long as it |
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| 285 | * includes at least one column label and at least one cell below |
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| 286 | * the column label in which you specify a condition for the |
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| 287 | * column. |
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| 288 | * |
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| 289 | * @return mixed |
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| 290 | */ |
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| 291 | 1 | public static function DGET($database, $field, $criteria) |
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| 292 | { |
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| 293 | 1 | $field = self::fieldExtract($database, $field); |
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| 294 | 1 | if ($field === null) { |
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| 295 | return null; |
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| 296 | } |
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| 297 | |||
| 298 | // Return |
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| 299 | 1 | $colData = self::getFilteredColumn($database, $field, $criteria); |
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| 300 | 1 | if (count($colData) > 1) { |
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| 301 | return Functions::NAN(); |
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| 302 | } |
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| 303 | |||
| 304 | 1 | return $colData[0]; |
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| 305 | } |
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| 306 | |||
| 307 | /** |
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| 308 | * DMAX. |
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| 309 | * |
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| 310 | * Returns the largest number in a column of a list or database that matches conditions you that |
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| 311 | * specify. |
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| 312 | * |
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| 313 | * Excel Function: |
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| 314 | * DMAX(database,field,criteria) |
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| 315 | * |
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| 316 | * @category Database Functions |
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| 317 | * |
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| 318 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 319 | * A database is a list of related data in which rows of related |
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| 320 | * information are records, and columns of data are fields. The |
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| 321 | * first row of the list contains labels for each column. |
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| 322 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 323 | * column label enclosed between double quotation marks, such as |
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| 324 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 325 | * represents the position of the column within the list: 1 for |
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| 326 | * the first column, 2 for the second column, and so on. |
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| 327 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 328 | * You can use any range for the criteria argument, as long as it |
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| 329 | * includes at least one column label and at least one cell below |
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| 330 | * the column label in which you specify a condition for the |
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| 331 | * column. |
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| 332 | * |
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| 333 | * @return float |
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| 334 | */ |
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| 335 | 1 | public static function DMAX($database, $field, $criteria) |
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| 336 | { |
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| 337 | 1 | $field = self::fieldExtract($database, $field); |
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| 338 | 1 | if ($field === null) { |
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| 339 | return null; |
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| 340 | } |
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| 341 | |||
| 342 | // Return |
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| 343 | 1 | return Statistical::MAX( |
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| 344 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 345 | ); |
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| 346 | } |
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| 347 | |||
| 348 | /** |
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| 349 | * DMIN. |
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| 350 | * |
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| 351 | * Returns the smallest number in a column of a list or database that matches conditions you that |
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| 352 | * specify. |
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| 353 | * |
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| 354 | * Excel Function: |
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| 355 | * DMIN(database,field,criteria) |
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| 356 | * |
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| 357 | * @category Database Functions |
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| 358 | * |
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| 359 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 360 | * A database is a list of related data in which rows of related |
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| 361 | * information are records, and columns of data are fields. The |
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| 362 | * first row of the list contains labels for each column. |
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| 363 | * @param int|string $field Indicates which column is used in the function. Enter the |
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| 364 | * column label enclosed between double quotation marks, such as |
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| 365 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 366 | * represents the position of the column within the list: 1 for |
||
| 367 | * the first column, 2 for the second column, and so on. |
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| 368 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 369 | * You can use any range for the criteria argument, as long as it |
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| 370 | * includes at least one column label and at least one cell below |
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| 371 | * the column label in which you specify a condition for the |
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| 372 | * column. |
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| 373 | * |
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| 374 | * @return float |
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| 375 | */ |
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| 376 | 1 | public static function DMIN($database, $field, $criteria) |
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| 377 | { |
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| 378 | 1 | $field = self::fieldExtract($database, $field); |
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| 379 | 1 | if ($field === null) { |
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| 380 | return null; |
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| 381 | } |
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| 382 | |||
| 383 | // Return |
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| 384 | 1 | return Statistical::MIN( |
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| 385 | 1 | self::getFilteredColumn($database, $field, $criteria) |
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| 386 | ); |
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| 387 | } |
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| 388 | |||
| 389 | /** |
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| 390 | * DPRODUCT. |
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| 391 | * |
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| 392 | * Multiplies the values in a column of a list or database that match conditions that you specify. |
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| 393 | * |
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| 394 | * Excel Function: |
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| 395 | * DPRODUCT(database,field,criteria) |
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| 396 | * |
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| 397 | * @category Database Functions |
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| 398 | * |
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| 399 | * @param mixed[] $database The range of cells that makes up the list or database. |
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| 400 | * A database is a list of related data in which rows of related |
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| 401 | * information are records, and columns of data are fields. The |
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| 402 | * first row of the list contains labels for each column. |
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| 403 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 404 | * column label enclosed between double quotation marks, such as |
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| 405 | * "Age" or "Yield," or a number (without quotation marks) that |
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| 406 | * represents the position of the column within the list: 1 for |
||
| 407 | * the first column, 2 for the second column, and so on. |
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| 408 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
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| 409 | * You can use any range for the criteria argument, as long as it |
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| 410 | * includes at least one column label and at least one cell below |
||
| 411 | * the column label in which you specify a condition for the |
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| 412 | * column. |
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| 413 | * |
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| 414 | * @return float |
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| 415 | */ |
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| 416 | 1 | public static function DPRODUCT($database, $field, $criteria) |
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| 417 | { |
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| 418 | 1 | $field = self::fieldExtract($database, $field); |
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| 419 | 1 | if ($field === null) { |
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| 420 | return null; |
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| 421 | } |
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| 422 | |||
| 423 | // Return |
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| 424 | 1 | return MathTrig::PRODUCT( |
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| 425 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 426 | ); |
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| 427 | } |
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| 428 | |||
| 429 | /** |
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| 430 | * DSTDEV. |
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| 431 | * |
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| 432 | * Estimates the standard deviation of a population based on a sample by using the numbers in a |
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| 433 | * column of a list or database that match conditions that you specify. |
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| 434 | * |
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| 435 | * Excel Function: |
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| 436 | * DSTDEV(database,field,criteria) |
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| 437 | * |
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| 438 | * @category Database Functions |
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| 439 | * |
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| 440 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 441 | * A database is a list of related data in which rows of related |
||
| 442 | * information are records, and columns of data are fields. The |
||
| 443 | * first row of the list contains labels for each column. |
||
| 444 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 445 | * column label enclosed between double quotation marks, such as |
||
| 446 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 447 | * represents the position of the column within the list: 1 for |
||
| 448 | * the first column, 2 for the second column, and so on. |
||
| 449 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 450 | * You can use any range for the criteria argument, as long as it |
||
| 451 | * includes at least one column label and at least one cell below |
||
| 452 | * the column label in which you specify a condition for the |
||
| 453 | * column. |
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| 454 | * |
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| 455 | * @return float |
||
| 456 | */ |
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| 457 | 1 | public static function DSTDEV($database, $field, $criteria) |
|
| 458 | { |
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| 459 | 1 | $field = self::fieldExtract($database, $field); |
|
| 460 | 1 | if ($field === null) { |
|
| 461 | return null; |
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| 462 | } |
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| 463 | |||
| 464 | // Return |
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| 465 | 1 | return Statistical::STDEV( |
|
| 466 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 467 | ); |
||
| 468 | } |
||
| 469 | |||
| 470 | /** |
||
| 471 | * DSTDEVP. |
||
| 472 | * |
||
| 473 | * Calculates the standard deviation of a population based on the entire population by using the |
||
| 474 | * numbers in a column of a list or database that match conditions that you specify. |
||
| 475 | * |
||
| 476 | * Excel Function: |
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| 477 | * DSTDEVP(database,field,criteria) |
||
| 478 | * |
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| 479 | * @category Database Functions |
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| 480 | * |
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| 481 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 482 | * A database is a list of related data in which rows of related |
||
| 483 | * information are records, and columns of data are fields. The |
||
| 484 | * first row of the list contains labels for each column. |
||
| 485 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 486 | * column label enclosed between double quotation marks, such as |
||
| 487 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 488 | * represents the position of the column within the list: 1 for |
||
| 489 | * the first column, 2 for the second column, and so on. |
||
| 490 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 491 | * You can use any range for the criteria argument, as long as it |
||
| 492 | * includes at least one column label and at least one cell below |
||
| 493 | * the column label in which you specify a condition for the |
||
| 494 | * column. |
||
| 495 | * |
||
| 496 | * @return float |
||
| 497 | */ |
||
| 498 | 1 | public static function DSTDEVP($database, $field, $criteria) |
|
| 499 | { |
||
| 500 | 1 | $field = self::fieldExtract($database, $field); |
|
| 501 | 1 | if ($field === null) { |
|
| 502 | return null; |
||
| 503 | } |
||
| 504 | |||
| 505 | // Return |
||
| 506 | 1 | return Statistical::STDEVP( |
|
| 507 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 508 | ); |
||
| 509 | } |
||
| 510 | |||
| 511 | /** |
||
| 512 | * DSUM. |
||
| 513 | * |
||
| 514 | * Adds the numbers in a column of a list or database that match conditions that you specify. |
||
| 515 | * |
||
| 516 | * Excel Function: |
||
| 517 | * DSUM(database,field,criteria) |
||
| 518 | * |
||
| 519 | * @category Database Functions |
||
| 520 | * |
||
| 521 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 522 | * A database is a list of related data in which rows of related |
||
| 523 | * information are records, and columns of data are fields. The |
||
| 524 | * first row of the list contains labels for each column. |
||
| 525 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 526 | * column label enclosed between double quotation marks, such as |
||
| 527 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 528 | * represents the position of the column within the list: 1 for |
||
| 529 | * the first column, 2 for the second column, and so on. |
||
| 530 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 531 | * You can use any range for the criteria argument, as long as it |
||
| 532 | * includes at least one column label and at least one cell below |
||
| 533 | * the column label in which you specify a condition for the |
||
| 534 | * column. |
||
| 535 | * |
||
| 536 | * @return float |
||
| 537 | */ |
||
| 538 | public static function DSUM($database, $field, $criteria) |
||
| 539 | { |
||
| 540 | $field = self::fieldExtract($database, $field); |
||
| 541 | if ($field === null) { |
||
| 542 | return null; |
||
| 543 | } |
||
| 544 | |||
| 545 | // Return |
||
| 546 | return MathTrig::SUM( |
||
| 547 | self::getFilteredColumn($database, $field, $criteria) |
||
| 548 | ); |
||
| 549 | } |
||
| 550 | |||
| 551 | /** |
||
| 552 | * DVAR. |
||
| 553 | * |
||
| 554 | * Estimates the variance of a population based on a sample by using the numbers in a column |
||
| 555 | * of a list or database that match conditions that you specify. |
||
| 556 | * |
||
| 557 | * Excel Function: |
||
| 558 | * DVAR(database,field,criteria) |
||
| 559 | * |
||
| 560 | * @category Database Functions |
||
| 561 | * |
||
| 562 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 563 | * A database is a list of related data in which rows of related |
||
| 564 | * information are records, and columns of data are fields. The |
||
| 565 | * first row of the list contains labels for each column. |
||
| 566 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 567 | * column label enclosed between double quotation marks, such as |
||
| 568 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 569 | * represents the position of the column within the list: 1 for |
||
| 570 | * the first column, 2 for the second column, and so on. |
||
| 571 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 572 | * You can use any range for the criteria argument, as long as it |
||
| 573 | * includes at least one column label and at least one cell below |
||
| 574 | * the column label in which you specify a condition for the |
||
| 575 | * column. |
||
| 576 | * |
||
| 577 | * @return float |
||
| 578 | */ |
||
| 579 | 1 | public static function DVAR($database, $field, $criteria) |
|
| 580 | { |
||
| 581 | 1 | $field = self::fieldExtract($database, $field); |
|
| 582 | 1 | if ($field === null) { |
|
| 583 | return null; |
||
| 584 | } |
||
| 585 | |||
| 586 | // Return |
||
| 587 | 1 | return Statistical::VARFunc( |
|
| 588 | 1 | self::getFilteredColumn($database, $field, $criteria) |
|
| 589 | ); |
||
| 590 | } |
||
| 591 | |||
| 592 | /** |
||
| 593 | * DVARP. |
||
| 594 | * |
||
| 595 | * Calculates the variance of a population based on the entire population by using the numbers |
||
| 596 | * in a column of a list or database that match conditions that you specify. |
||
| 597 | * |
||
| 598 | * Excel Function: |
||
| 599 | * DVARP(database,field,criteria) |
||
| 600 | * |
||
| 601 | * @category Database Functions |
||
| 602 | * |
||
| 603 | * @param mixed[] $database The range of cells that makes up the list or database. |
||
| 604 | * A database is a list of related data in which rows of related |
||
| 605 | * information are records, and columns of data are fields. The |
||
| 606 | * first row of the list contains labels for each column. |
||
| 607 | * @param int|string $field Indicates which column is used in the function. Enter the |
||
| 608 | * column label enclosed between double quotation marks, such as |
||
| 609 | * "Age" or "Yield," or a number (without quotation marks) that |
||
| 610 | * represents the position of the column within the list: 1 for |
||
| 611 | * the first column, 2 for the second column, and so on. |
||
| 612 | * @param mixed[] $criteria The range of cells that contains the conditions you specify. |
||
| 613 | * You can use any range for the criteria argument, as long as it |
||
| 614 | * includes at least one column label and at least one cell below |
||
| 615 | * the column label in which you specify a condition for the |
||
| 616 | * column. |
||
| 617 | * |
||
| 618 | * @return float |
||
| 619 | */ |
||
| 620 | 1 | public static function DVARP($database, $field, $criteria) |
|
| 630 | ); |
||
| 631 | } |
||
| 632 | } |
||
| 633 |
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