is_nan

This function returns whether a given variable is NaN (not a number) or not, returning true if it is, and false if it is not.

Syntax:

is_nan(n);

Returns:

Boolean

Example:

if is_nan(global.value)
    {
    show_debug_message("Value is not a number");
    }

The above code checks the global variable "value" to see if it is a number or not and shows a debug message if it isn't.