Since the inner product of two vectors if the cos of the
angle between them:
> A <- c(0,1); O <- c(0,0); B <- c(1,0)
> acos((A-O) %*% (B-O)) * 180 / pi
[,1]
[1,] 90
On Tue, Sep 1, 2009 at 9:08 AM,
clair.crossup...@googlemail.com<clair.crossup...@googlemail.com>
wrote:
> Dear all,
>
> I was doing some self study and was wondering if a function already
> exists which allows one to determine the angle between points. e.g.
> given the following (x,y) coordinates
>
> input: (0,1); (0,0); (1,0)
>
> would result in:
>
> output: 90 degrees
>
> Best regards
> C.C.
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