Problem using nanmean

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1 个投票

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.

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Answer 1

Jan 2012-3-21

在 MATLAB Online 中打开

1 个投票

   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;