[R] distance between consecutive points

[Peter Alspach]

Tena koe D'Arcy

You might find dist() more suited to your needs.

HTH ....

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Darcy Webber
> Sent: Wednesday, 16 February 2011 1:10 p.m.
> To: r-help at r-project.org
> Subject: [R] distance between consecutive points
> 
> Dear R users,
> 
> I have two coloumns of data, say x and y, referring to a list of
> points in 2D space. I am trying to develop a code that will give me
> the distances (using Pythagoras) between consecutive points (xi,yi)
> and (xi+1,yi+1). So far I have come up with the following:
> 
> for (i in 1:length(x)) d<-sqrt((x[i+1]-x[i])^2+(y[i+1]-y[i])^2)
> 
> For example, if I use the two points (note, I have hundreds of points
> for x,y)
> x<-c(64.59,64.60)
> y<-c(-179.28,-179.28)
> 
> d should be 0.01.
> 
> But it just doesn't give me the correct answer and I can't figure out
> why. Any help would be much appreciated.
> 
> Cheers,
> D'Arcy
> 
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> and provide commented, minimal, self-contained, reproducible code.

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