The isnan function returns whether input is Not-a-Number (NaN) value.

Syntax ​

isnan( X )

Arguments ​

• X: A real number.

Results ​

A non-zero value (true) if X is NaN, and zero (false) otherwise.

Examples ​

This returns false:

print isnan( 42 )

This returns true:

print x = toint( 'pizza' )
| extend y = isnan( x )