how can i patch a circle in the origin of the axis?

wich cordinates can i use

[Iddo Weiner]

If I understood correctly, this will do the job:

rad = 10; %this is the radius (change it if you like)
angle = 0:0.001:2*pi; % a full circle range 
x_cord = rad*cos(angle);
y_cord = rad*sin(angle);
plot(x_cord, y_cord);
hold on
plot(xlim,[0 0])
plot([0 0],ylim)
hold off

And if this isn't what you meant, could you pls provide a more detailed explanation of what exactly you need?

[juan diego villada]

thanks Iddo , that was what i needed

[Iddo Weiner]

Glad to help..

If you could accept an answer it would be of help for the next people who read this question.. My answer is given below, and KSSV's answer is essentially the same so - whichever one, it doesn't really matter...

Good luck

Answer 1

[KSSV]

clc; clear all ;
R = 1 ;
th = linspace(0,2*pi) ;
x = R*cos(th) ; 
y = R*sin(th) ;

patch(x,y,'r') ;
axis equal

Answer 2

[Iddo Weiner]

See my initial answer, I posted it as a comment by mistake:

rad = 10; %this is the radius (change it if you like)
angle = 0:0.001:2*pi; % a full circle range 
x_cord = rad*cos(angle);
y_cord = rad*sin(angle);
plot(x_cord, y_cord);
hold on
plot(xlim,[0 0])
plot([0 0],ylim)
hold off