na

Syntax Format

na(value)

Overview

The na function checks if the value is unavailable, i.e., whether the value is nan or nil. The function is useful when doing checks on provided data in a script before performing further operations with it.

Parameters

Parameter	Purpose
value	Input value

Returns: boolean.

Example

div = close / open

if na(div) then
   print("Value is not a number or is nil")
end