MATLAB: Treating NaN as a unique value (instead of as a distinct)

Question

In

http://www.mathworks.de/help/techdoc/ref/unique.html

there is the following example:

Unique Values in Array Containing NaNs

A = [5 5 NaN NaN];

C = unique(A)

C =

     5   NaN   NaN
unique treats NaN values as distinct.

IS it possible to treat NaN as a unique value so at to have

C=5 NaN

Answer 1

Write this function...

function y = myUnique(x)
  y = unique(x);
  if any(isnan(y))
    y(isnan(y)) = []; % remove all nans
    y(end+1) = NaN; % add the unique one.
  end
end