For loop isn't working, unsure as to why

In the following code, 'forrest', 'shrub', 'sav', 'grass' and 'agri' have all been initialized at 35*43 matrices of NaNs.

'lut' and 'D10weight' are also 35,43 matrices. The idea is that each of 'forrest', 'shrub', 'sav', 'grass' and 'agri' get values from 'D10weight' where 'lut' equals a certain number. However they all remain as NaNs and I am unsure why.

for i = 1:35;
    j = 1:43;

      if lut(i,j) == 1
          forrest(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 2
          shrub(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 3
          sav(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 4
          grass(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 5
          agri(i,j) = D10weight(i,j);
      end
  end

Answer 1

[James Tursa]

I think you meant for this to be a double for loop. As coded, you only have one for loop and j is a vector. E.g., is this what you meant?

for i = 1:35;
   for j = 1:43;

      if lut(i,j) == 1
          forrest(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 2
          shrub(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 3
          sav(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 4
          grass(i,j) = D10weight(i,j);
      end

      if lut(i,j) == 5
          agri(i,j) = D10weight(i,j);
      end

    end
 end

[Robert]

Thanks, looks like that was the problem all along, it's obvious now that you've pointed it out. Thanks again

Answer 2

[Image Analyst]

Here is a way 100% guaranteed to help you solve it: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

Have you tried actually stepping through line by line and checking the value of lut(i,j) and seeing why your "if" statements never get true and so never assigns anything?