src/PHPSci/Kernel/CArray/Wrapper.php
public static function subtract(\CArray $a, \CArray $b): \CArray
    {
        return parent::subtract($a, $b);
    }
public static function subtract(\CArray $a, \CArray $b): \CArray
    {
        return parent::subtract($a, $b);
    }
public static function subtract ( \ CArray $ a , \ CArray $ b ) : \ CArray { return parent :: subtract ( $ a , $ b ) ; }
Subtract two CArrays, element-wise.

@param \CArray $a Target CArray $a
@param \CArray $b Target CArray $b

@return \CArray The difference of $a and $b, element-wise.
Subtract two CArrays element - wise .