Thats a good start but I am looking for more. Specifically (from previous post):
4x4 matrix (based on the maximum number of factor levels in 'o') for each 'id' as a list. Each matrix would have v in the diagonal and r*s*s in the off-diagonal (e.g., .5*2.0814*.1095 = 0.1139), where r is constant (.5) and s varies based on the wthin 'id' factor level of 'o'. The output would look something like this (except values in all cells): [[id 1]] 'o'-levels [,1] [,2] [,3] [,4] [1,] .702 .1139 r*s1*s3 ... [2,] .1139 .702 r*s2*s3 ... [3,] r*s3*s1 ... . 702 [4,] .702 [[id 2]] 'o'-levels [,1] [,2] [,3] [,4] [1,] .702 NA r*s1*s3 ... [2,] NA .702 NA ... [3,] r*s3*s1 NA .702 [4,] ... .702 Thanks, AC On Thu, Nov 3, 2011 at 9:25 AM, jose Bartolomei <surfpr...@hotmail.com>wrote: > > I missed; using the Hadley Wickham plyr package > > >library (plyr) > > dlply(dat, .(id)) > $`1` > > id o r v s > 1 1 1 0.5 -1.7131858 -2.0548666 > 2 1 2 0.5 0.6582979 0.9688939 > 3 1 3 0.5 -0.6861830 2.4213072 > 4 1 4 0.5 1.4134171 -0.4540244 > $`2` > id o r v s > 5 2 1 0.5 0.2771839 1.0688474 > 6 2 3 0.5 -0.7543462 -1.0371494 > 7 2 4 0.5 -1.9810018 -0.6742232 > > > > Date: Thu, 3 Nov 2011 08:54:52 -0700 > > From: de...@wisc.edu > > To: r-help@r-project.org > > Subject: [R] Take variables in data.frame and create list of matrices > > > > Hi, > > > > I have this sample data below and would like to create a list of > matricies. > > > > setseed(1254) > > id <- c(1,1,1,1 ,2,2,2) > > o <- as.factor(c(1:4, 1, 3, 4)) > > r <- rep(.5, 7) > > v <- rnorm(7) > > s <- rnorm(7) > > > > dat <-data.frame(id, o, r, v, s) > > dat > > > > #> dat > > # id o r v s > > # 1 1 0.5 0.7024631 2.0813672 > > # 1 2 0.5 -0.5541955 0.1095156 > > # 1 3 0.5 -1.0418167 0.4164930 > > # 1 4 0.5 1.9973868 -2.0402058 > > # 2 1 0.5 1.3957243 -0.2548652 > > # 2 3 0.5 -0.6571325 0.6946570 > > # 2 4 0.5 1.3998202 0.4601017 > > > > Is there an easy way (or convenient function) to convert this into a list > > where each unique 'id' has > > its own 4x4 matrix (based on the maximum number of factor levels in > 'o')in > > the list? > > Each matrix would have v in the diagonal and r*s*s in the off-diagonal > > (e.g., > > .5*2.0814*.1095 = 0.1139), where > > r is constant (.5) and s varies based on the wthin 'id' factor level of > > 'o'. > > The output would look something like this (except values in all cells): > > > > [[id 1]] > > > > 'o'-levels [,1] [,2] [,3] [,4] > > > > [1,] .702 .1139 r*s1*s3 ... > > > > [2,] .1139 .702 r*s2*s3 ... > > > > [3,] r*s3*s1 ... . 702 > > > > [4,] .702 > > > > > > [[id 2]] > > > > 'o'-levels [,1] [,2] [,3] [,4] > > > > [1,] .702 NA r*s1*s3 ... > > > > [2,] NA .702 NA ... > > > > [3,] r*s3*s1 NA .702 > > > > [4,] ... .702 > > > > > > any assistance is much appreciated. > > > > Thank you, > > > > AC > > > > [[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. > [[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.
