/**
* @param \Wandu\Math\LinearAlgebra\Matrix $other
* @return \Wandu\Math\LinearAlgebra\Matrix
*/
public function multiplyWithMatrix(Matrix $other)
{
if ($this->colSize !== $other->rowSize) {
throw new InvalidArgumentException('cannot calculate, because of size.');
}
$newRowSize = $this->rowSize;
$newColSize = $other->colSize;
$newItems = [];
for ($rowIndex = 0; $rowIndex < $newRowSize; $rowIndex++) {
for ($colIndex = 0; $colIndex < $newColSize; $colIndex++) {
$newItems[$rowIndex][$colIndex] = $this->getRowVector($rowIndex)->dot($other->getColVector($colIndex));
}
}
return new static($this->rowSize, $other->colSize, $newItems);
}
public function testEqual()
{
$this->assertEquals(matrix([[0, 0], [0, 0]]), Matrix::zeros(2, 2));
}
