for loop

 i have G={[1 0 1;1 0 0;0 0 1;1 1 1] and out put should be I={[1 0;1 0; 0 0;1 1]} how can i get 
using for loop

[Fangjun Jiang]

Not sure if you understand the meaning of {} in MATLAB. It is used to reference cell array. Your example data indicates no need of it. Please do not use it unnecessarily because it might confuse readers regarding your data structure.

Answer 1

[Daniel Shub]

If you do not have to use a for loop you can just do:

I = G(:, 1:2)

but if you have to use a for loop:

for ii = 1:size(G, 1)
  I(ii, 1:2) = G(ii, 1:2);
end

Answer 2

[Fangjun Jiang]

Assume the element in I is the first two columns of the element in G.

G=[1 0 1;1 0 0;0 0 1;1 1 1];
[M,N]=size(G);
I=zeros(M,2);
for k=1:size(G,1)
    I(k,:)=G(k,1:2);
end

Without for-loop, you can do.

I=G(:,1:2)

[Andrei Bobrov]

for j1 = 1:size(I,2)

I(:,j1) = G(:,j1);

end

[Daniel Shub]

and I am giving a +1 to Fanqjun since he (assuming he) gave the same answer, and typed faster than me.