isnan()

Learn how to use the isnan() function to check if the input is a not-a-number (NaN) value.

Returns whether the input is a Not-a-Number (NaN) value.

Syntax

isnan(number)

Parameters

NameTypeRequiredDescription
numberscalar✔️The value to check if NaN.

Returns

true if x is NaN and false otherwise.

Example

range x from -1 to 1 step 1
| extend y = (-1*x) 
| extend div = 1.0*x/y
| extend isnan=isnan(div)

Output

xydivisnan
-11-1false
00NaNtrue
1-1-1false

Related content

  • To check if a value is null, see isnull().
  • To check if a value is finite, see isfinite().
  • To check if a value is infinite, see isinf().