PHP PHPML\Exception MatrixException Examples

Example #1

File: Matrix.php Project: php-ai/php-ml

 /**
  * @return Matrix
  *
  * @throws MatrixException
  */
 public function inverse()
 {
     if (!$this->isSquare()) {
         throw MatrixException::notSquareMatrix();
     }
     $newMatrix = array();
     for ($i = 0; $i < $this->rows; ++$i) {
         for ($j = 0; $j < $this->columns; ++$j) {
             $minor = $this->crossOut($i, $j)->getDeterminant();
             $newMatrix[$i][$j] = fmod((double) ($i + $j), 2.0) == 0 ? $minor : -$minor;
         }
     }
     $cofactorMatrix = new self($newMatrix, false);
     return $cofactorMatrix->transpose()->divideByScalar($this->getDeterminant());
 }