How can I add a circle to this..

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peter obi
peter obi 2015-11-13
评论： peter obi 2015-11-14
I just started learning mathlab and I wanted to plot a circle on this figure.. more like a car. please how do i do it.. x=[0,0,1,2,3,4,5,5,0] y=[0,1,1,2,2,1,1,0,0]. Thank you

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KSSV
KSSV 2015-11-13
Let the center of circle be (a,b) and radius be 'r'. Use parametric equations of circle.
x = a+r*cos(theta) ; y = b+r*sin(theta) ;
You have to define theta into a array.
use hold on ;
plot(x,y,'r') ;
this will plot circle on the given plot.

更多回答（1 个）

Image Analyst
Image Analyst 2015-11-13
See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_create_a_circle.3F
Or alternatively you could use rectangle() (believe it or not, see the help), or
plot(x,y,'MarkerSize', 100).
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Image Analyst
Image Analyst 2015-11-13
It looks like you accepted the Answer from the FAQ. But if you just want to put a circle on a graph, you can do it much simpler with rectangle or plot. Just experiment with different MarkerSizes to get the size you want. Typically if you don't specify it, I think it's something like 8 or so. But if you want larger, use bigger numbers. I just guessed at 100 but you could try 20 or 50 or whatever. It's probably faster because you're not plotting an array of a bunch of points like if you use a parameterized circle.
peter obi
peter obi 2015-11-14
Thank you bro.. worked also..

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