/**
* power
*
* A = A ^ B
* @param mixed $B Matrix/Array
* @return Matrix Sum
*/
public function power()
{
if (func_num_args() > 0) {
$args = func_get_args();
$match = implode(",", array_map('gettype', $args));
switch ($match) {
case 'object':
if ($args[0] instanceof Matrix) {
$M = $args[0];
} else {
throw new \PHPExcel\Calculation\Exception(self::ARGUMENT_TYPE_EXCEPTION);
}
break;
case 'array':
$M = new Matrix($args[0]);
break;
default:
throw new \PHPExcel\Calculation\Exception(self::POLYMORPHIC_ARGUMENT_EXCEPTION);
break;
}
$this->checkMatrixDimensions($M);
for ($i = 0; $i < $this->m; ++$i) {
for ($j = 0; $j < $this->n; ++$j) {
$validValues = true;
$value = $M->get($i, $j);
if (is_string($this->A[$i][$j]) && strlen($this->A[$i][$j]) > 0 && !is_numeric($this->A[$i][$j])) {
$this->A[$i][$j] = trim($this->A[$i][$j], '"');
$validValues &= \PHPExcel\Shared\StringHelper::convertToNumberIfFraction($this->A[$i][$j]);
}
if (is_string($value) && strlen($value) > 0 && !is_numeric($value)) {
$value = trim($value, '"');
$validValues &= \PHPExcel\Shared\StringHelper::convertToNumberIfFraction($value);
}
if ($validValues) {
$this->A[$i][$j] = pow($this->A[$i][$j], $value);
} else {
$this->A[$i][$j] = PHPExcel_Calculation_Functions::NAN();
}
}
}
return $this;
} else {
throw new \PHPExcel\Calculation\Exception(self::POLYMORPHIC_ARGUMENT_EXCEPTION);
}
}
