Why am I getting an error of "error: X(433,_): but X has size 1x1 error: called from naiveHough at line 70 column 13"

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Pijush 2018-9-15

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https://ww2.mathworks.cn/matlabcentral/answers/419119-why-am-i-getting-an-error-of-error-x-433-_-but-x-has-size-1x1-error-called-from-naivehough

评论： Pijush 2018-9-15

I am wrting a code for hough transformation in octave. Taking help from here

function [ Hough, theta_range, rho_range ] = naiveHough(I)
%NAIVEHOUGH Peforms the Hough transform in a straightforward way.
%
pkg load image
I=imread('aa.jpg');
%I=I.*255;
%I=uint8(I);
%I=uint8(I)<50;
%I=I.*255;
%imshow(I)
      [rows, cols] = size(I);
      theta_maximum = 90;
      rho_maximum = floor(sqrt(rows^2 + cols^2)) - 1;
      theta_range = -theta_maximum:theta_maximum - 1;
      rho_range = -rho_maximum:rho_maximum;
      Hough = zeros(length(rho_range), length(theta_range));
      wb = waitbar(0, 'Naive Hough Transform');
      for row = 1:(rows-1)
          waitbar(row/rows, wb);
          for col = 1:(cols-1)
              if I(row, col) > 0
                  x = col - 1;
                  y = row - 1;
                  for theta = theta_range
                      rho = round((x * cosd(theta)) + (y * sind(theta)));                   
                      rho_index = rho + rho_maximum + 1;
                      theta_index = theta + theta_maximum + 1;
                      Hough(rho_index, theta_index) = Hough(rho_index, theta_index) + 1;
                  end
              end
          end
      end
      close(wb);
      Hough=Hough.*2;
      subplot(2,2,1)
  imhist(uint8(Hough))
   subplot(2,2,2)
   imshow(uint8(Hough))
   values = 1:255;
   threshold_value = sort(values,'descend');
   XX=threshold_value(5)
   X=(Hough)>XX;
    subplot(2,2,3)
   imshow(X)
   %%%%%%%%%%%%%%%MY CODE %%%%%%%%%%%%%%%%%%%%
   [M,N]=size(X);
             %PLot the Line back again from the Hough Space to Image%
   for row = 1:(M-1)
          for col = 1:(N-1)
              if X(row, col) > 0                    %%%%Line 70 %%%%%
                 the=(col-90);
                 R=row;
                 X=R*cosd(the);
                 Y=R*sind(the);
                plot(X,Y);
                 hold ("on");
              end
          end
      end
       hold ("off");