Fast sampling every other element in a matrix

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.

Answer 1

[Andrei Bobrov]

M2 = M(1:2:end,1:2:end);

[Christopher]

Much faster, thanks

[Orongo]

what does the parameter 'end' mean here?

[Stephen23]

@Orongo: "The end function also serves as the last index in an indexing expression"

source: https://www.mathworks.com/help/matlab/ref/end.html