public function multiplicationScalar($multiplier)
{
$result = new Matrix($this->matrix->getNumRows(), $this->matrix->getNumCols(), $this->precision);
for ($row = 1; $row <= $this->matrix->getNumRows(); $row++) {
for ($col = 1; $col <= $this->matrix->getNumCols(); $col++) {
$newValue = bcmul($this->matrix->getPoint($row, $col), $multiplier, $this->precision);
$result->setPoint($row, $col, $newValue);
}
}
return $result;
}
/**
* @param $i
* @param $j
* @return Matrix
*/
public function cofactor($i, $j)
{
$cofactor = new Matrix($this->matrix->getNumRows() - 1, $this->matrix->getNumCols() - 1, $this->precision);
for ($m = 1; $m <= $this->matrix->getNumRows(); $m++) {
for ($n = 1; $n <= $this->matrix->getNumCols(); $n++) {
if ($m == $i || $n == $j) {
continue;
}
$row = $m < $i ? $m : $m - 1;
$col = $n < $j ? $n : $n - 1;
$cofactor->setPoint($row, $col, $this->matrix->getPoint($m, $n));
}
}
return $cofactor;
}
