Problem using nanmean

Hi..

I want to find mean for array ingonring NaN. So i looked up in Matlab website and they suggest to use nanmean. I try the example but it returns '??? Undefined command/function 'nanmean''.

For Example:

   X = magic(3);

   X([1 6:9]) = repmat(NaN,1,5)

X =

   NaN     1   NaN
     3     5   NaN
     4   NaN   NaN

y = nanmean(X)

The result should be as following:

y = 3.5000 3.0000 NaN

But in my Matlab software, it returns ??? Undefined command/function 'nanmean'.

Is it because my Matlab version is 7.0.1?

Im new to Matlab. Thanks in advance for your help.

Answer 1

[Jan]

   X = magic(3);
   X([1 6:9]) = NaN;  % faster than: repmat(NaN,1,5)

   index = isnan(X);
   Y = X;
   Y(index) = 0;
   n = sum(~index, 1);
   n(n == 0) = NaN;
   M = sum(Y, 1) ./ n;

See also: FEX: NaN suite.

[Muhammad Affandi]

thanks jan.. it worked

Answer 2

[Wayne King]

nanmean was available in version 7.0.1 but you have to have the Statistics Toolbox. Do you have the Statistics Toolbox in your installation, enter

>>ver

to see what you have installed.