Matlab: Circle Plotting Error

Replies

• 

  ISHAN TOPRE

  #-Link-Snipped-# do you know matlab?
  This is bresenham's circle algorithm.
• 

  ISHAN TOPRE

  #-Link-Snipped-# #-Link-Snipped-# anyone from computer science.
• 

  Abhishek Rawal

  #-Link-Snipped-# No idea on anything related to Matlab even though I am from ECE discipline. Sorry.
• 

  Shashank Moghe

  Issue

  I have a matlab program. In that program I do not know the function for plotting a circle. Whether it is fplot, ez plot, funplot. Can any body guide me?
  

  clc, clear all, clf,close
  a = input('Give the centre X coord : ');     % X coord of centre
  b = input('Give the centre Y coord : ');     % Y coord of centre
  r = input('Give the radius of circle : ');   % Radius of the circle to be drawn
  inc = input('Give the increment step for coordinate[Default:1]: '); % Use the value
  if isempty(inc)                              % of inc greater than 1
      inc =1;                                  % usually less than radius
  end
   
  x = 0;
  y = r;
  d= 3-2*r;
   
  while(x < y)
      plot(a,b,x,y,r);
      if d>=0
          d = d +4*(x-y)+10;
          x = x + 1/inc;
          y = y - 1/inc;
      else
          d = d + 4*x +6;
          x = x+1/inc;
      end
  end
  plot(a,b,p,q,r)
  for i= -1:2:1
      for j= -1:2:1
          plot(a+i*p,b+j*q,'r.');
          plot(a+i*q,b+j*p,'r.');
          grid off
          hold on
      end
  end
  title('Bresenham circle')
  axis([a-r-1 a+r+1 b-r-1 b+r+1])
  axis equal;

  
  What exactly do you want to accomplish? Do you want a readymade fn() or do you want to use the algorithm?
  
  Are you saying the algorithm code does not plot what you want it to plot?
• 

  ISHAN TOPRE

  I wanted a function to be used instead of "funplot". Apparently the problem was solved.
• 

  Shashank Moghe

  Issue

  I wanted a function to be used instead of "funplot". Apparently the problem was solved.

  
  What did you use instead of plot()? You can also do one easy trick in such cases, in case you are not sure of which plotting fn() to use: Go to the variables window, select the variables you want to plot, and on the top of that sub-window, there is a plot "tool", more like a drop down, which gives you a complete idea about all the possible plots you can get.
• 

  ISHAN TOPRE

  I used funplot only. There was an error with variables defined.
• 

  Shashank Moghe

  On a side note, I am surprised how little Engineers use Matlab 😔 It is by far Computational Science's best tool ever!