php-ai /
php-ml
| @@ 204-208 (lines=5) @@ | ||
| 201 | */ |
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| 202 | public function isNonsingular() |
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| 203 | { |
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| 204 | for ($j = 0; $j < $this->n; ++$j) { |
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| 205 | if ($this->LU[$j][$j] == 0) { |
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| 206 | return false; |
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| 207 | } |
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| 208 | } |
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| 209 | return true; |
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| 210 | } // function isNonsingular() |
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| 211 | ||
| @@ 222-224 (lines=3) @@ | ||
| 219 | { |
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| 220 | if ($this->m == $this->n) { |
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| 221 | $d = $this->pivsign; |
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| 222 | for ($j = 0; $j < $this->n; ++$j) { |
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| 223 | $d *= $this->LU[$j][$j]; |
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| 224 | } |
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| 225 | return $d; |
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| 226 | } else { |
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| 227 | throw MatrixException::notSquareMatrix(); |
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