Folkes, Michael <Michael.Folkes <at> dfo-mpo.gc.ca> writes: > I'm having trouble making contour lines for this attached, sparse > dataset (low data:NA ratio!). Is it the high number of NA's, or funny > layout of the densities, or something else that's causing this? > > ####start data to be in file='testmatrix.csv' > > "0.5","1","1.5","2","2.5","3" > "-0.833",NA,NA,NA,NA,NA,21.05 > "-0.8",NA,NA,NA,NA,10.62,NA > "-0.75",NA,NA,NA,5.13,NA,NA > "-0.667",NA,NA,2.24,NA,NA,11.68
contour needs a more data, it's rather a plotting workhorse and not so good for interpolation. There are examples for spatial statistics in library/MASS/scripts/ch15.R and in "the book" by Venables/Ripley. You might also search for "geo" in the packages, because your problem is fairly common in geographical ecology. Dieter ______________________________________________ [email protected] 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.
