/**
* @return Matrix
*/
private function getTargetsMatrix()
{
if (is_array($this->targets[0])) {
return new Matrix($this->targets);
}
return Matrix::fromFlatArray($this->targets);
}
/**
* @param Matrix $matrix
*
* @return Matrix
*
* @throws InvalidArgumentException
*/
public function multiply(Matrix $matrix)
{
if ($this->columns != $matrix->getRows()) {
throw InvalidArgumentException::inconsistentMatrixSupplied();
}
$product = [];
$multiplier = $matrix->toArray();
for ($i = 0; $i < $this->rows; ++$i) {
$columns = $matrix->getColumns();
for ($j = 0; $j < $columns; ++$j) {
$product[$i][$j] = 0;
for ($k = 0; $k < $this->columns; ++$k) {
$product[$i][$j] += $this->matrix[$i][$k] * $multiplier[$k][$j];
}
}
}
return new self($product, false);
}
public function testCrossOutMatrix()
{
$matrix = new Matrix([[3, 4, 2], [4, 5, 5], [1, 1, 1]]);
$crossOuted = [[3, 2], [1, 1]];
$this->assertEquals($crossOuted, $matrix->crossOut(1, 1)->toArray());
}
