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isnan()

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

Syntax

isnan(x)

Arguments

  • x: A real number.

Returns

A non-zero value (true) if x is NaN; and zero (false) otherwise.

See also

  • For checking if value is null, see isnull().
  • For checking if value is finite, see isfinite().
  • For checking if value is infinite, see isinf().

Example

range x from -1 to 1 step 1
| extend y = (-1*x) 
| extend div = 1.0*x/y
| extend isnan=isnan(div)
x y div isnan
-1 1 -1 0
0 0 NaN 1
1 -1 -1 0