Re: Difference of columns

[Ismael Núñez-Riboni]

> I would like a code giving me a matrix B having three
> columns:C_1-C_2,C_1_C_3 and C_2-C_3
> regards

My code does that, i.e., making all combinations of columns (including a 
column with itself) and subtracting one from the other. If you don't 
want the combination of a column with itself you can modify the code 
like this:

cc = 1;

for i = 1:N
   for j = 1:N
      if i ~= j
         diff(:,cc) = A(:,i) - A(:,j);

         cc = cc +1;
      end
   end
end

Cheers, I.