Hello, Here is a possibility:
library(maptools) XY <- cbind(X=c(100,102,104,102,103),Y=c(12,14,14,13,16)) dst <- spDists(XY[1:4,],XY[2:5,],longlat=TRUE) ?spDists HTH, Pascal Le 18/12/2012 18:56, Johannes Radinger a écrit :
Hi, I have a dataframe containing 3 columns: data.frame(X=c(100,102,104,102,103),Y=c(12,14,14,13,16),Time=c(1,2,3,4,5)) where X and Y are coordinates and "Time" refers to an index of a timestep. Now I would like to get the distance between the consecutive timesteps. This should actually provide a vector of length=4, representing the euclidian resp. geopgraphic distance between the first and the second, and the second and the third timestep and so on... Is there a simple way to calculate this and get the resulting vector as a result? Or can anyone give an example? best regards, /j ______________________________________________ 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.
______________________________________________ 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.
