nanstd (Statistics Toolbox)

Standard deviation ignoring NaNs.

Syntax

y = nanstd(X)

Description

nanstd(X) the standard deviation treating NaNs as missing values.

For vectors, nanstd(x) is the standard deviation of the non-NaN elements of x. For matrices, nanstd(X) is a row vector containing the standard deviations of the non-NaN elements in each column of X.

Example

m = magic(3);
m([1 6 8]) = [NaN NaN NaN]

m =

   NaN     1     6
     3     5   NaN
     4   NaN     2


nstd = nanstd(m)

nstd =

    0.7071    2.8284    2.8284