Tena koe D'Arcy You might find dist() more suited to your needs.
HTH .... Peter Alspach > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Darcy Webber > Sent: Wednesday, 16 February 2011 1:10 p.m. > To: r-help@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 > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting- > guide.html > and provide commented, minimal, self-contained, reproducible code. The contents of this e-mail are confidential and may be subject to legal privilege. If you are not the intended recipient you must not use, disseminate, distribute or reproduce all or any part of this e-mail or attachments. If you have received this e-mail in error, please notify the sender and delete all material pertaining to this e-mail. Any opinion or views expressed in this e-mail are those of the individual sender and may not represent those of The New Zealand Institute for Plant and Food Research Limited. ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
