thnx sarah!!!thnx for saving my time regardseliza
> Date: Wed, 14 Nov 2012 09:44:58 -0500 > Subject: Re: [R] reversing distance matrix for original values > From: sarah.gos...@gmail.com > To: eliza_bo...@hotmail.com > CC: r-help@r-project.org > > Hi Eliza, > > On Wed, Nov 14, 2012 at 9:33 AM, eliza botto <eliza_bo...@hotmail.com> wrote: > > > > dear useRs, > > i created a distance matrix, of certain voltage values. unfortunately, i > > lost the original values. i am only left with the distance matrix that i > > created from those values. i wanted to ask that is there a way in R to > > reverse distance matrix for the original values? > > There is not, and a bit of thought will tell you why. > > Say you used Euclidean distance as your metric, and only had one variable. > > For a distance of 2, the original data could be: > dist(c(10, 12)) > dist(c(5, 7)) > dist(c(7, 5)) > dist(c(1, 3)) > dist(c(100000, 100002)) > dist(c(2, 4)) > dist(c(2.1, 4.1)) > dist(c(2.2, 4.2)) > > and so on. Even with known bounds on your voltage values, there are an > infinite number of equivalent solutions. I suppose you could try to > treat it as a system of X equations and X unknowns and find possible > solutions, but that doesn't get you back your original data. > > Sarah > -- > Sarah Goslee > http://www.functionaldiversity.org [[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.
