MATLAB: How to flip only some rows inside a matrix

Question

Hi, I have a matrix xx which is a 6×20 matrix, and I want to flip only the even rows. Im trying this but is doesn't work:

f=size(xx);

f=f(1);

f=0:1:f;

f=f';

for s=f+2

        xx(f,:)=fliplr(xx(f,:));

end

I will appreciate any advice. Martha

Answer 1

A(2:2:end,:)=fliplr(A(2:2:end,:))