Matrix Extraction based on summation.

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Fayyaz
Fayyaz 2015-4-7
回答： John D'Errico 2015-4-7
Hi.
I have 81*81 matrix. I need to extract a matrix from that, for example of order 81*2, which include two columns i.e. the 34th column and the sum of 22,39 and 59 columns.
I will be really thankful for any suggestion or help. Thanks

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John D'Errico
John D'Errico 2015-4-7
Easy peasy.
B = A(:,[34 22 39 59])*[1 0 0 0;0 1 1 1]';

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