Question

I have the following function in matlab.

function s = value(x, y)
            for i=1:length(y)
                for j=1:length(y)
                    if y(i,j) ~= 0.5;
                        pixels = x(i,j);
                    end
                end
            end
            pixels
        end

When I run it, I just get the last pixel in the results. How can I get the vector of all results?

Thanks.

Answer 1

You need to keep an index:

function pixels = value(x, y)

pIndex = 1;

for i=1:length(y)
   for j=1:length(y)
      if y(i,j) ~= 0.5;
         pixels(pIndex) = x(i,j);
         pIndex = pIndex + 1;
      end
   end
end

pixels

end

However, you should vectorise your code to make it more efficient and easy to read, that function could be replaced by:

pixels = x(y ~= 0.5)