nested for loop keeping i constant through all, until end of j's

Hi, I am running a nested for loop

 for i
  for j 
  end 
 end

and I would like i=1 while j=1, 2, 3, 4, 5

 i=2 j=1, 2, 3, 4, 5
 i=3 j=1, 2, 3, 4, 5
 ...
 i=5 j=1, 2, 3, 4, 5

is this an if or a while loop?

Thanks for any help!

[Stephen23]

Note that you should not name your variables i or j, as these are both names of the inbuilt imaginary unit. Common alternatives are ii and jj, or more descriptive names such as iter_row.

[Thorsten]

i and j are very common loop counters, and they result in code that is readable and concise. I think it's ok to use them and use 1i for the complex unit, as advised by Matlab's help page:

For speed and improved robustness in complex arithmetic, use 1i and 1j instead of i and j.

Answer 1

[Thorsten]

Use two for-loops:

for i=1:4
  fprintf('i = %d, j = ', i)
  for j = 1:4
    fprintf('%d,', j)
  end
  fprintf('\b\n')
end