index and matrix selection

2012 11 12
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Hi,
my index matrixis size(index)=118*4. the data matrix is size(data)=2970290*9
iwa nt to select just index-data.
i wrote this:
data_new=data([index],:). the size of this matrix is:472*9.
I want to get the matrix with the size 118*36. I dont want to use reshape. do you know something better than my statement (data_new=data([index],:))
Thanks

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José-Luis
José-Luis 2012-11-12

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cell2mat(arrayfun(@(x) {data(x,:)},index,'uniformoutput',false));
Using reshape should be faster though.

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