php-ai /
php-ml
| @@ 219-223 (lines=5) @@ | ||
| 216 | */ |
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| 217 | public function isNonsingular(): bool |
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| 218 | { |
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| 219 | for ($j = 0; $j < $this->n; ++$j) { |
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| 220 | if ($this->LU[$j][$j] == 0) { |
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| 221 | return false; |
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| 222 | } |
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| 223 | } |
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| 224 | ||
| 225 | return true; |
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| 226 | } |
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| @@ 242-244 (lines=3) @@ | ||
| 239 | } |
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| 240 | ||
| 241 | $d = $this->pivsign; |
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| 242 | for ($j = 0; $j < $this->n; ++$j) { |
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| 243 | $d *= $this->LU[$j][$j]; |
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| 244 | } |
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| 245 | ||
| 246 | return $d; |
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| 247 | } |
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