index and matrix selection

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

Answer 1

[José-Luis]

 cell2mat(arrayfun(@(x) {data(x,:)},index,'uniformoutput',false));

Using reshape should be faster though.