Thread Subject:

points inside a circle

I have to vectors a,b and I want to draw a circle with its centre in a certain point eg (a(5),b(5)) and radius 1. The problem is that I don't actually want to draw the circle, but I just want to find which pairs of elements of my two vectors are inside it. I know how to do it with a rectangular but how does it work with a circle?
Thanks in advance

"Konst " <konstance1@hotmail.com> wrote in message <jooms0$ims$1@newscl01ah.mathworks.com>...
> I have to vectors a,b and I want to draw a circle with its centre in a certain point eg (a(5),b(5)) and radius 1. The problem is that I don't actually want to draw the circle, but I just want to find which pairs of elements of my two vectors are inside it. I know how to do it with a rectangular but how does it work with a circle?
> Thanks in advance

What is the relation between the radius of a circle, and the
Euclidean distance between a point and the center of a circle?

What does that information tell you about if that point is
inside the circle?

John

Have you ever heard of the Pythagorean Theorem? If you want, you can
use the hypot() function in MATLAB.