Do a search for Dirichlet, that may give you the tools you need. Also for plotting 3 vectors that sum to 1, instead of a 3d scatter plot you should look into a triangle or trilinear plot, see ?triplot in the TeachingDemos package (the see also for that help page lists several other implementations in other packages as well).
-- Gregory (Greg) L. Snow Ph.D. Statistical Data Center Intermountain Healthcare greg.s...@imail.org 801.408.8111 > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Christopher Desjardins > Sent: Tuesday, March 29, 2011 10:20 AM > To: r-help@r-project.org > Subject: [R] Creating 3 vectors that sum to 1 > > I have 3 vectors: p1, p2, and p3. I would like each vector to be any > possible value between 0 and 1 and p1 + p2 + p3 = 1. I want to graph > these > and I've thought about using scatterplot3d(). Here's what I have so > far. > > library(scatterplot3d) > p1 <- c(1,0,0,.5,.5,0,.5,.25,.25,.34,.33,.33,.8,.1,.1,.9,.05,.05) > p2 <- c(0,1,0,.5,0,.5,.25,.5,.25,.33,.34,.33,.1,.8,.1,.05,.9,.05) > p3 <- c(0,0,1,0,.5,.5,.25,.25,.5,.33,.33,.34,.1,.1,.8,.05,.05,.9) > scatterplot3d(p1,p2,p3) > > > However, I wonder if there is an easy way to create vectors p1, p2, and > p3. > > [[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. ______________________________________________ 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.