Returns true for entries of an array that are NaN's (i.e., Not-a-Numbers). The usage is
y = 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
or dcomplex
data types that
the result is true if either the real or imaginary parts
are NaNs.
Suppose we have an array of floats with one element that
is nan
:
--> a = [1.2 3.4 nan 5] a = <double> - size: [1 4] Columns 1 to 2 1.200000000000000 3.400000000000000 Columns 3 to 4 nan 5.000000000000000 --> isnan(a) ans = <logical> - size: [1 4] Columns 1 to 4 0 0 1 0