On Sun, Nov 23, 2008 at 7:43 PM, Ben Bolker <[EMAIL PROTECTED]> wrote: > Rainer M Krug <r.m.krug <at> gmail.com> writes: > >> >> Hi >> >> I want to du a sensitivity analysis using Latin Hypercubes. But my >> parameters have to fulfill two conditions: >> >> 1) ranging from 0 to 1 >> 2) have to sum up to 1 >> > > Perhaps I'm missing something, but it seems that there's > only one vector that satisfies these two conditions simultaneously, > which is x={0,1} ... ??? (Actually, technically speaking > you could have as many zeros as you wanted -- x = {0,0,0,1} > would also work -- but I don't think that's going to help much.) > If min(x)=0 and max(x)=1, then x must contain 0 and 1. If x > contains any other non-zero values, and no negative > ones, then sum(x)>1 ...
You are absolutely right - but when you look at the example, I want that the FINAL latin hypercube sets sum up to one, and the values RANGING from 0 to 1, i.e. (0.5, 0.5) would also satisfy the condition. > > You seem to have a problem either in your definitions, > or in your communication of those definitions to us ... Probably both - but to try again: 1) values ranging between 0 and 1 (0 <= x <= 1) 2) all elements in one set of the lLatin Hypercube should add to one. Assuming two dimensions, (1,0) & (0,1) & (0.3, 0.7) , ... would all satisfy the condition 1 and 2; (0.8, 0.3) would satisfy 1, but not 2; (-1, 2) would satisfy 2, but not 1 Hope this clarifies my question, Rainer > > cheers > Ben Bolker > > ______________________________________________ > 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. > -- Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation Biology, UCT), Dipl. Phys. (Germany) Centre of Excellence for Invasion Biology Faculty of Science Natural Sciences Building Private Bag X1 University of Stellenbosch Matieland 7602 South Africa ______________________________________________ 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.