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 2014-01-14 03:06:43 -0500 asked a question Iterate matrix and copy out Hi all, Hi all, I have a problem with some matrix operations. I have one matrix MatOriginal and I want copy out into another one, only the range from (0,0) to (300,300). So I try to iterate the original one (MatOriginal) and copy out, my code is: a = 0; b = 0;  for(int x = 0; x < 300; x++) { for(int y = 0; y < 300; y++) { MatNew.at(a,b) = MatOriginal.at(x,y); a++; } b++; }  But this doesn't works... anyone can help me please?