|
public rowInterchange ( integer $mᵢ, integer $mⱼ ) : |
||
| $mᵢ | integer | Row to swap into row position mⱼ |
| $mⱼ | integer | Row to swap into row position mᵢ |
| return | with rows mᵢ and mⱼ interchanged | |
public function rowInterchange(int $mᵢ, int $mⱼ) : Matrix
{
if ($mᵢ >= $this->m || $mⱼ >= $this->m) {
throw new Exception\MatrixException('Row to interchange does not exist');
}
$m = $this->m;
$R = [];
for ($i = 0; $i < $m; $i++) {
switch ($i) {
case $mᵢ:
$R[$i] = $this->A[$mⱼ];
break;
case $mⱼ:
$R[$i] = $this->A[$mᵢ];
break;
default:
$R[$i] = $this->A[$i];
}
}
return MatrixFactory::create($R);
}