MATLAB: Matlab exercise help me

exampleexercise

Hello everyone, I need help in an exercise I need to know how I can get the pairs of a square matrix of i, j (no, the even numbers of the matrix)

Try this:

output = [A(1,1), a(1,3), A(2,2), A(3,1), A(3,2)]

Or, for odd-size matrices

output = A(1:2:end);

a=zeros(4,7);
a(:,1:2:end)=A;
a(:,2:2:end)=B;
b=zeros(3,7);
b(:,1:2:end)=C;
b(:,2:2:end)=D;
out=zeros(7);
out(1:2:end,:)=a;
out(2:2:end,:)=b

If you look at this site in the section called Anecdotes" you will see a short cut to obtaining your answer. It doesn't require matlab at all.