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

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");

[Rik]

You are overwriting X inside your loop.

[Walter Roberson]

 X=R*cosd(the);

is the overwriting line.

[Pijush]

Yes I got the point and I have change X to X1, Thank you!