finding the a average of matrix any better way
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a=[2 4 5;3 2 1;2 3 8;4 1 9];
average=sum(sum(a))/numel(a)
Any better way to do this..
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Walter Roberson
2012년 5월 16일
mean(a(:))
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Jan
2012년 5월 16일
For some Matlab versions, sum(sum(a))/numel(a) is measurable faster than mean(a(:)) for two reasons: In pre-2011 (don't know exactly the release number) versions of Matlab, sum(A) was vectorized, when A has multiple dimensions, while a vector was processed in one thread only. For very small vectors the overhead of calling the M-file mean mattered.
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