Select partial output of a function into a new function

Question

I have a matrix, say:

y=rand(100,101);

Now I would like to average over the first dimension, and use only part of the output (say only the odd indices) into another function. So I could do

ymean=mean(y,1)

and then

ymean_partial=somefunction(ymean(1:2:length(ymean)))

But my question now is (assuming it is possible): how can I do this without having to declare the 'dummy variable' ymean? I would like to know if there's a one-liner I could use, since this extra variable takes up a lot of memory for larger matrices (and I tend to like one-liners).

Many thanks!

Please see this related question: http://stackoverflow.com/questions/3627107/how-can-i-index-a-matlab-array-returned-by-a-function-without-first-assigning-it — H.Muster, Sep 05 '13 at 09:57
Oh great, that's actually the general solution I was looking for, although Jonas' answer works perfectly in this case. — Fraukje, Sep 05 '13 at 10:02

score 6 · Accepted Answer · answered Sep 05 '13 at 09:47

6

Why don't you simply take the mean on the subset only?

ymean_subset = mean(y(:,1:2:end),1);

answered Sep 05 '13 at 09:47

Jonas

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I don't know why I didn't....I got stuck in a certain thinking pattern I guess. Thanks! – Fraukje Sep 05 '13 at 09:55

Select partial output of a function into a new function

1 Answers1