How can i loop through certain columns in matrix, for example, 3th, 5th, 6th and 7th column?

for i = 3 : [5 6 7]
   M = fitlm(trening(:,[2 4 i]),trening(:,1),'linear');
   e3(i) = M.SSE;
end
e3 = e3(3 : [5 6 7]);
e3 = min(e3);

Answer 1

[Geoff Hayes]

Try using

for k = [3 5 6 7]
   M = fitlm(trening(:,[2 4 k]),trening(:,1),'linear');
   e3(k) = M.SSE;
end

Though be aware that you will be updating the same columns (3,5,6,7) in e3 when you may be wanting to update the first four columns.

[NjZ]

Thanks!