How can I plot a simple circle not centered at the origin? example: (x-5)^2+(y-10)^2=4

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cassie 2014-1-31

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评论： Amit 2014-1-31

example: (x-5)^2+(y-10)^2=4 I actually want to plot several overlapping circles on the same graph. I have never used matlab prior to this week so if there is a way to do this using SIMPLE function, plot, ezplot, etc. that's what I'm looking for. Thank you.

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Amit 2014-1-31

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编辑：Amit 2014-1-31

在 MATLAB Online 中打开

You make a function for plotting the circle, something like this:

EDIT:

function plotcircle(x1,y1,r,c)
% x1,y1: center
% r = radius
theta = 0:0.05:2*pi;
hold on;
plot(x1+r*cos(theta),y1+r*sin(theta),c);
axis equal;

For for every circle, you can call this function: like

plotcircle(5,10,2,'r');

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cassie 2014-1-31

I did.... plot(x+r*cos(theta),y+r*sin(theta),c)

cassie 2014-1-31

I found my mistake... I didn't add the ,c at the very top. Thank you so much for your help!

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Image Analyst 2014-1-31

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https://ww2.mathworks.cn/matlabcentral/answers/114315-how-can-i-plot-a-simple-circle-not-centered-at-the-origin-example-x-5-2-y-10-2-4#answer_122775

Code samples are in the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F

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Image Analyst 2014-1-31

I didn't think you did. It's so very simple so I'm sure you thought of it independently. I just brought it up because I'm hoping the poster, or others, might also scan the other interesting stuff in there. A lot of people don't know about the existence of the FAQ, and won't unless we keep plugging it now and then.

Amit 2014-1-31