finding the a average of matrix any better way

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..

Answer 1

[Walter Roberson]

mean(a(:))

[Sharon]

thanks Walter..

[Jan]

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.

Answer 2

[Thomas]

Don't know if this is better..

a=[2 4 5;3 2 1;2 3 8;4 1 9];
average=mean(mean(a))

[Sharon]

thanks Thomas..