ISNAN Test for Not-a-Numbers
Section: Inspection Functions
Usage
Returns true for entries of an array that are NaN's (i.e., Not-a-Numbers). The usage isy = isnan(x)
The result is a logical array of the same size as x
,
which is true if x
is not-a-number, and false otherwise.
Note that for complex data types that
the result is true if either the real or imaginary parts
are NaNs.
Example
Suppose we have an array of floats with one element that isnan
:
--> a = [1.2 3.4 nan 5] a = 1.2000 3.4000 NaN 5.0000 --> isnan(a) ans = 0 0 1 0