Asked by Yasmine Tamimi
on 12 Mar 2011

How can I plot circles, same radius and different centers, all in one graph. I used the following command to draw +,o,diamond: plot (x,y,'ro',u,v,'gd',A,B,'b+'); where x,y,u,v,A,B are all row vectors. And I want to add circles to that plot where the o will be the center.

Answer by Paulo Silva
on 12 Mar 2011

Accepted answer

Here's a function to draw circles:

function circle(x,y,r) %x and y are the coordinates of the center of the circle %r is the radius of the circle %0.01 is the angle step, bigger values will draw the circle faster but %you might notice imperfections (not very smooth) ang=0:0.01:2*pi; xp=r*cos(ang); yp=r*sin(ang); plot(x+xp,y+yp); end

If you want to add circles you must insert the command

hold on

before the circles being added.

Firas
on 29 Dec 2014

That's awesome

Answer by Michelle Hirsch
on 29 Jan 2016

It's counter-intuitive, but this is actually really easy with the rectangle function. From the rectangle documentation :

pos = [2 4 2 2]; rectangle('Position',pos,'Curvature',[1 1]) axis equal

Image Analyst
on 29 Jan 2016

And with R2012a and later you can use viscircles

Ronald Mintz
on 14 Apr 2016

Thanks very much Michelle. Your idea made beautiful concentric circles. viscircles didn't work on my computer because I have version R2011a.

Image Analyst
on 14 Apr 2016

rectangle() is one of several methods listed in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F> You'll have lots of other nice improvements that they've made over the last 5 years if you upgrade.

Answer by Image Analyst
on 5 Jul 2012

Please refer to the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

Answer by Image Analyst
on 20 Jan 2016

There is now a function called viscircles(): http://www.mathworks.com/help/images/ref/viscircles.html?s_tid=srchtitle

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