Finding number of points inside a circle and assign them into a matrix

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E K
E K 2012-7-27
评论： m 2016-11-29
Hi guys,
I have a grid of dots (x,y) which lies on a plane, I am creating circles in the same plane which I know both radius and center coordinates of circle.
What I am trying to do is create a new matrix of (x,y) coordinates of dots which are inside the circle.
Thanks in advance

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bym
bym 2012-7-27
one way to do it:
clc;clear
xy = rand(100,2);
plot(xy(:,1),xy(:,2),'b.')
hold on
t = linspace(0,2*pi);
plot(.5+.25*cos(t),.5+.25*sin(t),'r-')
axis square
r = hypot(xy(:,1)-.5,xy(:,2)-.5);
plot(xy(r<=.25,1),xy(r<=.25,2),'go')

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