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<?php |
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/** |
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* |
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* (c) Ruben Dorado <[email protected]> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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*/ |
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namespace SiteAnalyzer; |
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/** |
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* class Matrix |
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* |
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* @package SiteAnalyzer |
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* @author Ruben Dorado <[email protected]> |
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* @copyright 2018 Ruben Dorado |
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* @license http://www.opensource.org/licenses/MIT The MIT License |
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*/ |
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class Matrix |
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{ |
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/* |
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* @param |
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*/ |
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public static function submatrix($matrix, $columns) |
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{ |
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$n = count($matrix); |
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if ($n == 0) return []; |
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$m = count($matrix[0]); |
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if ($m == 0) return $matrix; |
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$result = []; |
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for ($i=0; $i<$n; $i++) { |
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$tmp = []; |
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foreach ($columns as $col) { |
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$tmp[] = $matrix[$i][$col]; |
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} |
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$result[] = $tmp; |
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} |
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return $result; |
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} |
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/* |
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* @param |
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*/ |
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public static function toSquareMatrix($matrix, $ncol, $mcol, $vcol, $sparse = False) |
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{ |
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$n = count($matrix); |
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if ($n == 0) return []; |
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$labels = []; |
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$id = 0; |
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$data = []; |
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for ($i=0; $i<$n; $i++) { |
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if (!array_key_exists($matrix[$i][$ncol],$labels)) { |
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$labels[$matrix[$i][$ncol]] = $id++; |
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} |
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$nid = $labels[$matrix[$i][$ncol]]; |
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if (!array_key_exists($matrix[$i][$mcol],$labels)) { |
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$labels[$matrix[$i][$mcol]] = $id++; |
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} |
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$mid = $labels[$matrix[$i][$mcol]]; |
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$val = $matrix[$i][$vcol]; |
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$data[] = [$nid, $mid, $val]; |
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} |
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if ($sparse) return ["data" => $data, "labels" => $labels]; |
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$nlab = count($labels); |
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$result = []; |
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for ($i=0; $i<$nlab; $i++) { |
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$tmp = array_fill(0, $nlab, 0); |
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$result[] = $tmp; |
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} |
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foreach ($data as $row) { |
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$result[$row[0]][$row[1]] = $row[2]; |
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} |
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return ["data" => $result, "labels" => $labels]; |
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} |
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/* |
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* @param |
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*/ |
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public static function sum($matrix1, $matrix2) |
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{ |
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$result = []; |
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$n = count($matrix1); |
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if ($n != count($matrix2)) throw new \Exception("Summing non compatible matrices. "); |
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$m = count($matrix1[0]); |
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for ($i=0;$i<$n;$i++) { |
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$tmp = []; |
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for($j=0;$j<$m;$j++) { |
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$tmp[] = $matrix1[$i][$j] + $matrix2[$i][$j]; |
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} |
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$result[] = $tmp; |
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} |
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return $result; |
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} |
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/* |
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* @param |
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*/ |
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public static function multiply($matrix1, $matrix2) |
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{ |
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$n1 = count($matrix1); |
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$m1 = count($matrix1[0]); |
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$n2 = count($matrix2); |
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$m2 = count($matrix2[0]); |
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if ($n2 !== $m1) throw new \Exception("Incompatible matrices: matrix1.columns != matrix2.rows"); |
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$result = []; |
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for ($i=0; $i<$n1; $i++) { |
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$result[] = array_fill(0, $m2, 0); |
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} |
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for ($i=0; $i<$n1; $i++) { |
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for ($j=0; $j<$m2; $j++) { |
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for ($k=0; $k<$n2; $k++) { |
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$result[$i][$j] += $matrix1[$i][$k]*$matrix2[$k][$j]; |
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} |
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} |
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} |
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return $result; |
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} |
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/* |
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* @param |
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*/ |
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public static function toBinary($matrix) { |
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$resp = []; |
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foreach ($matrix as $row) { |
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$tmp = []; |
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foreach ($row as $dat) { |
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$tmp[] = $dat == 0 ? 0 : 1; |
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} |
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$resp[] = $tmp; |
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} |
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return $resp; |
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} |
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/* |
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* @param |
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*/ |
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public static function arrayToMatrix($array) { |
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$resp = []; |
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foreach ($array as $key => $val) { |
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$resp[] = [$key, $val]; |
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} |
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return $resp; |
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} |
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/* |
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* @param |
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*/ |
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public static function power($matrix, $n) |
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{ |
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if($n <= 1) return $matrix; |
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$resp = self::multiply($matrix, $matrix); |
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if($n == 2) return $resp; |
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for($i=2; $i<$n; $i++) { |
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$resp = self::multiply($resp, $matrix); |
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} |
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return $resp; |
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} |
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/* |
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* @param |
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*/ |
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public static function sumArray($array1, $array2) { |
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$resp = []; |
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$n = min([count($array1), count($array2)]); |
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for ($i=0;$i<$n;$i++){ |
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$resp[] = $array1[$i] + $array2[$i]; |
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} |
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return $resp; |
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} |
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} |
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rdorado /
site-analyzer
