MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

# plotting circles

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.

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Answer by Paulo Silva on 12 Mar 2011

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
```

Answer by Yasmine Tamimi on 12 Mar 2011

Thanx a lot

Answer by Ahmet on 28 May 2012

i did not run it can you help me? i copied and pasted to the editor but it did not run

## 1 Comment

Anurag on 5 Jul 2012

define x=0,y=0 and r=some constant

Answer by Image Analyst on 5 Jul 2012