/**
* Tests if cache will be flushed after using NumArray::abs
*/
public function testAbsCache()
{
$numArray = new NumArray(5);
$numArray->setCache('key', 6);
$numArray->abs();
$this->assertFalse($numArray->inCache('key'));
}
/**
* Tests if cache will be flushed after use of NumArray::sub
*/
public function testSubCache()
{
$numArray = new NumArray(5);
$numArray->setCache('key', 7);
$numArray->sub(3);
$this->assertFalse($numArray->inCache('key'));
}
/**
* Tests Cache::flushCache
*/
public function testFlushCacheKey()
{
$numArray = new NumArray(5);
$numArray->setCache('key1', 7);
$numArray->setCache('key2', 8);
$numArray->flushCache('key2');
$this->assertSame(7, $numArray->getCache('key1'));
$this->assertFalse($numArray->inCache('key2'));
}
/**
* Calculates the inverse of a not singular square matrix
*
* @param mixed $squareMatrix not singular matrix
*
* @throws SingularMatrixException will be thrown, when `$squareMatrix` is singular
*
* @api
* @since 1.0.0
*
* @return NumArray
*/
public static function inv($squareMatrix)
{
if (!$squareMatrix instanceof NumArray) {
$squareMatrix = new NumArray($squareMatrix);
} elseif ($squareMatrix->inCache(self::CACHE_KEY_INVERSE)) {
return $squareMatrix->getCache(self::CACHE_KEY_INVERSE);
}
if (!Helper::isNotSingularMatrix($squareMatrix)) {
throw new SingularMatrixException("Matrix is singular");
}
$shape = $squareMatrix->getShape();
$inv = self::solve($squareMatrix, NumPHP::identity($shape[0]));
$squareMatrix->setCache(self::CACHE_KEY_INVERSE, $inv);
return self::inv($squareMatrix);
}