Fast sampling every other element in a matrix

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Christopher
Christopher 2014-10-2
评论： Stephen23 2019-2-15
I have a matrix M. I want to delete every other column and every other row. However, I already know how to do this as:
M = rand(100,11);
M2=M;
M2(:,2:2:end)=[];
M2(2:2:end,:)=[];
I will have to do this operation on large matrices many times in a loop, thus I am wondering if matlab has a built-in function to do this faster. Thanks.

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Andrei Bobrov
Andrei Bobrov 2014-10-2
M2 = M(1:2:end,1:2:end);

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