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how to take the average of a matrix of any size

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lowcalorie
lowcalorie 2012-3-14
How do I compute the mean of all the values in a matrix of any size

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回答（2 个）

Wayne King
Wayne King 2012-3-14
mean()
X = randn(100,100);
mean(mean(X))
or
mean(X(:))
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Wayne King
Wayne King 2012-3-14
If you want the means of the columns or the rows, you can use mean() with the dimension argument
X = mean(X,1);
or
X = mean(X,2);
Honglei Chen
Honglei Chen 2012-3-14
Wayne's answer is for matrix of any size. Just try it out.

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Sean de Wolski
Sean de Wolski 2012-3-14
mean(X(:))
or for speed:
N = numel(X);
sum(reshape(X,N,1))/N;
or for fun:
eval([repmat('mean(',1,ndims(X)) 'X' repmat(')',1,ndims(X)) ';']);
  1 个评论
Jan
Jan 2012-3-15
A strange definition of "fun".
I think, that "sum(X(:))/numel(X)" is more fun, it is even _nice_.

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