How to compute the indices of a square matrix?

Hi all,

Imagine I have indices: i, j, k, l, I write

for i = 1:1
 for j = 1:1
  for k = 1:2
   for l = 1:2
    SOME OPERATIONS
   end
  end
 end
end

From SOME OPERATIONS I'd like to find the indices for a 3 by 3 matrix, i.e by some operations of "i j k l", I can find:

1, 1
1, 2
1, 3
2, 1
2, 2
2, 3
3, 1
3, 2
3, 3
(of course not necessarily in this order)

I tried to replace SOME OPERATIONS with

disp([i + k , j + l])

it only gives me

1     1
1     2
2     2
1     1
1     3
2     3
1     1
1     2
3     2
1     1
1     3
3     3

not what I want, any ideas?

Answer 1

[Rafael Hernandez-Walls]

Deal with the following code:

i=1;

j=1;

for k=0:2

    for l=0:2

       disp([i+k,j+l])

    end

end

Answer 2

[Image Analyst]

Check out line 126 and 129 of my attached manual convolution code. It does what you want - it gets the indices of each point as you scan the matrix with a 3x3 window.

[Xh Du]

Hi,

This is a really complex code, would you please demo with the simple example I gave? Thanks!