plotting circles

조회 수: 1,134 (최근 30일)
Yasmin Tamimi
Yasmin Tamimi 2011년 3월 12일
댓글: Michelle Hirsch 2023년 12월 11일
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.
  댓글 수: 1
fatima ibrahim
fatima ibrahim 2020년 2월 29일
function draw_circle1(x,y,R,c)
t =0:0.05:6.28;
x1 = (x +R*cos(t))';
y1= (x +R*sin(t))';

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채택된 답변

Paulo Silva
Paulo Silva 2011년 3월 12일
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.
  댓글 수: 8
Rik
Rik 2020년 5월 3일
It's the step size. You can use the colon in two ways when you create an array:
start:stop
start:step:stop
Özgür Saglam
Özgür Saglam 2020년 5월 3일
Thank you very much!

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추가 답변 (3개)

Michelle Hirsch
Michelle Hirsch 2016년 1월 29일
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
  댓글 수: 5
Royi Avital
Royi Avital 2023년 12월 10일
@Michelle Hirsch, It would be great if it had the DisplayName property like most other objects.
It makes easier when adding it to the legend.
Michelle Hirsch
Michelle Hirsch 2023년 12월 11일
@Royi Avital I think it's more than just adding DisplayName - annotations like rectangle (intentionally) don't show up in legend since they are meant to be annotations, not data. Are you interested in being able to include annotations in legend? If so, please share more about your use case so I make sure we understand what you are thinking.

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Chad Greene
Chad Greene 2014년 8월 21일
This'll do the job.

Image Analyst
Image Analyst 2016년 1월 20일
편집: Image Analyst 2022년 4월 15일
numCircles = 15;
x = 5 + randi(95, numCircles, 1);
y = 5 + randi(95, numCircles, 1);
radius = 2 * ones(numCircles, 1);
viscircles([x, y], radius);
grid on;
axis equal

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