# Draw multiple circles in one image

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Latifa Bouguessaa
on 27 Jul 2022

Commented: Walter Roberson
on 12 Aug 2022

Hello, everyone,

I need your help. I wanted to draw several circles in one picture and edit them later. Attached is a screen shot. thank you for your help

Latifa

##### 0 Comments

### Accepted Answer

KSSV
on 27 Jul 2022

Edited: KSSV
on 27 Jul 2022

R = 2:2:10 ;

th = linspace(0,2*pi) ;

figure

hold on

for i = 1:length(R)

x = R(i)*cos(th) ;

y = R(i)*sin(th) ;

plot(x,y)

end

axis equal

##### 9 Comments

Image Analyst
on 12 Aug 2022

Walter Roberson
on 12 Aug 2022

You cannot reliably recreate the roi given just the subimage and comparing it to 0, as interior pixels could be 0.

You could, it is true, take the subimage and fit a circle to it to recreate the roi.

But if you are going to need the roi later, just record the mask variables as well, it saves a lot of trouble.

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