MATLAB Function Reference

isnan

Detect NaN elements of an array

Syntax

• TF = isnan(A)
  

Description

TF = isnan(A) returns an array the same size as A containing logical true (1) where the elements of A are NaNs and logical false (0) where they are not.

For any A, exactly one of the three quantities isfinite(A), isinf(A), and isnan(A) is equal to one.

Examples

• a = [-2  -1  0  1  2]
  
  isnan(1./a)
  Warning: Divide by zero.
  
  ans =
       0     0     0     0     0
  
  isnan(0./a)
  Warning: Divide by zero.
  
  ans =
       0     0     1     0     0
  

See Also

isfinite, isinf, is*

ismethod (COM)

isnumeric