Replaces a value or complete parts in the NumArray. The new value is always the last argument
| public set ( ) |
/**
* @param NumArray $matrix
* @param NumArray $vector
* @return array
*/
protected static function gaussianEliminationPivoting(NumArray $matrix, NumArray $vector)
{
$shape = $matrix->getShape();
for ($i = 0; $i < $shape[0]; $i++) {
// find pivo element
$max = abs($matrix->get($i, $i)->getData());
$maxIndex = $i;
for ($j = $i + 1; $j < $shape[0]; $j++) {
$abs = abs($matrix->get($j, $i)->getData());
if ($abs > $max) {
$max = $abs;
$maxIndex = $j;
}
}
// pivoting
if ($maxIndex !== $i) {
// change maxIndex row with i row in $matrix
$temp = $matrix->get($i);
$matrix->set($i, $matrix->get($maxIndex));
$matrix->set($maxIndex, $temp);
// change maxIndex row with i row in $vector
$temp = $vector->get($i);
$vector->set($i, $vector->get($maxIndex));
$vector->set($maxIndex, $temp);
}
for ($j = $i + 1; $j < $shape[0]; $j++) {
$fac = -$matrix->get($j, $i)->getData() / $matrix->get($i, $i)->getData();
$matrix->set($j, $matrix->get($j)->add($matrix->get($i)->dot($fac)));
$vector->set($j, $vector->get($j)->add($vector->get($i)->dot($fac)));
}
}
return ['M' => $matrix, 'b' => $vector];
}
/**
* Tests if cache will be flushed after NumArray::set
*/
public function testSetCache()
{
$numArray = new NumArray(5);
$numArray->setCache('key', 6);
$numArray->set(6);
$this->assertFalse($numArray->inCache('key'));
}
