Hi, On Mon, May 9, 2011 at 9:40 AM, Pavan G <pavan.n...@gmail.com> wrote: > Hello All, > Let's say I have points on a x-y plane. x ranges from 0-2 and y from 0-2. > There are points in quadrants x[0:1]---y[0:1] and in x[1:2]----y[1:2]. I > would like to get the mean and std of the points in the x[0:1]----y[0:1] > quadrant alone. Is there a straight forward way to do it? > > I asked a similar question a few days ago regarding plotting a subset of > data using conditions. The solution was: > http://r.789695.n4.nabble.com/Conditional-plot-length-in-R-td3503855.html
The solution to this question will also be similar, I guess ... you should take some time to figure out how indexing with (different types of) vectors works: http://cran.r-project.org/doc/manuals/R-intro.html#Index-vectors If your question doesn't have to do with selecting the appropriate elements of your data, are you asking how to take a "mean" or std.dev of the subset of points you know how to select? It's not clear what you mean by "mean" ... do you want the average value of x vs. avg. value of y ... or do you want the "centroid" of a set of points in each quadrant, or ... what? > Thank you, > Why-so-serious. A curious choice for a valediction ... -- Steve Lianoglou Graduate Student: Computational Systems Biology | Memorial Sloan-Kettering Cancer Center | Weill Medical College of Cornell University Contact Info: http://cbio.mskcc.org/~lianos/contact ______________________________________________ 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.
