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How to draw a circle onimage data matirx (containing linear indices to colormap)

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simar
simar 2012-2-16
I have written the following code to do the operation but it doesn't seem to be working????
figure
M = 64 * ones (100,100)
image (M)
o = 0:0.1:2*pi;
r = 30;
M(50,50)=32;
M(int8(50+r*cos(o)),int8(50+r*sin(o)))=0;
M(50,50)=32;
image(M)

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Sean de Wolski
Sean de Wolski 2012-2-16
  2 个评论
simar
simar 2012-2-16
Thanks for help. But if you have time could you please explain ehy my method is not mathematically stable to generate a circle??
I'm still wondering ???
Sean de Wolski
Sean de Wolski 2012-2-17
If you run each of these commands separately:
int8(50+r*cos(o))
int8(50+r*sin(o))
You'll see they each create a vector. Thus the matric is going to create the equivalent of meshgrid(v1,v2) out of these two vectors. That's why you see the mesh shape in your image.

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