Check the R-news archive with approrpriate keywords. There was a long exchange awhile back when I asked a similar question.
On Oct 12, 2014, at 1:20 PM, Camilo Mora <cm...@dal.ca> wrote: > Hi everyone, > > I wonder if there is a code in r that can generate a 3d convex hull from a > data-frame containing 3 columns and then use another database with the same > three columns and for each row determine if the xyz point is inside or not > the convex hull generated with the first database? > > The package geometry allows to calculate a hull and it's volume. I was > planning to calculate the volume of the convex hull after adding each point > in the second database and if the hull gets bigger then the point is out and > if not then the point is in. A problem with this method is that I have over > 10 million points and the calculation for each point will take a lot of time. > > Any guidance will be greatly appreciated, > > Thanks, > > Camilo > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. Don McKenzie Research Ecologist Pacific Wildland Fire Sciences Lab US Forest Service Affiliate Professor School of Environmental and Forest Sciences University of Washington d...@uw.edu ______________________________________________ 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.
