My for loop isn't working

 dim_Bx = 377;
 dim_By = 494;

 for deg = 1:180

for img_line_B = 1:1000
      Co_Bx(img_line_B,1) = img_line_B * cosd(deg) + (dim_Bx/2);
      Co_By(img_line_B,2) = img_line_B * sind(deg) + (dim_By/2);
end

        Ref_Bx = round(Co_Bx(:,1));
        Ref_By = round(Co_By(:,2));

 end

Why does Co_By constantly give me 247??

Thanks!!

[Stephen23]

@Brian Cheung: your code is very badly formatted. If you used consistent formatting (e.g. the MATLAB default) then your problem would be a bit easier to identify:

dim_Bx = 377;
dim_By = 494;
for deg = 1:180
  for img_line_B = 1:1000
    Co_Bx(img_line_B,1) = img_line_B * cosd(deg) + (dim_Bx/2);
    Co_By(img_line_B,2) = img_line_B * sind(deg) + (dim_By/2);
  end
  Ref_Bx = round(Co_Bx(:,1));
  Ref_By = round(Co_By(:,2));
end

Now you can clearly see that you have two loop. Think about what the outside loop is doing.

Answer 1

[James Tursa]

Because you are constantly overwriting the value assigned to Co_By(img_line_B,2) with a new value because all of this is inside the for deg=1:180 loop. So only the last value sticks, and that last value used deg=180, so sind(180)=0 and the only thing left to assign is the dim_By/2 part (=247).