Muahmmad - if you want to save the r and c from each iteration, then you must create an array/vector for each and save the values for the ith iteration into these new arrays. For example, you know that iterate from 1 to size(r1,1), so initialize your r and c to be arrays of this size
rArray = zeros(size(r1,1),1);
cArray = zeros(size(r1,1),1);
for i = 1:size(r1,1)
for j = 1:500
% etc.
end
[rArray(i) cArray(i)] = min(RS);
ABC=fprintf('%5.5f\t %d\n',rArray(i),cArray(i));
end
Note how on each iteration we save the result of min to the arrays rArray and cArray. Now when you use the save command, use rArray and cArray which has all data from each iteration.
As an aside, consider using indexing variables other than i and j since MATLAB uses these to represent the imaginary number.
