is_matrix

This function returns whether a given variable refers to a matrix or not. In some cases you want to check and see what data type a variable holds in GameMaker and that's when you would use this function. It returns true or false depending on whether the value is a matrix or not.

Syntax:

is_matrix(n);

Returns:

Boolean

Example:

if !is_matrix(val)
{
    show_debug_message("Not a valid matrix!");
}

The above code checks the variable "val" to see if it contains a matrix and if it is not then it shows a message in the debug console.