php-ai /
php-ml
| @@ 219-223 (lines=5) @@ | ||
| 216 | */ |
|
| 217 | public function isNonsingular(): bool |
|
| 218 | { |
|
| 219 | for ($j = 0; $j < $this->n; ++$j) { |
|
| 220 | if ($this->LU[$j][$j] == 0) { |
|
| 221 | return false; |
|
| 222 | } |
|
| 223 | } |
|
| 224 | ||
| 225 | return true; |
|
| 226 | } |
|
| @@ 231-233 (lines=3) @@ | ||
| 228 | public function det(): float |
|
| 229 | { |
|
| 230 | $d = $this->pivsign; |
|
| 231 | for ($j = 0; $j < $this->n; ++$j) { |
|
| 232 | $d *= $this->LU[$j][$j]; |
|
| 233 | } |
|
| 234 | ||
| 235 | return (float) $d; |
|
| 236 | } |
|
