Hi, Can you provide sample data? It seems like in both matrices, you have ages in the rows. Do you just want to calculate birth years in matrix B from ages and years in matrix A?
It may also help to give us some of the details of what you are doing once you have transformed it prior to transforming back (e.g., are there changes that would impact what the code to convert back needs to be?). Josh On Fri, May 28, 2010 at 9:30 AM, UM <usman.muni...@imperial.ac.uk> wrote: > > hi, > I have been trying to do this in R (have implemented it in Excel) but I have > been using a very inefficent way (loops etc.). I have matrix A (columns are > years and ages are rows) and matrix B (columns are birth yrs and rows are > ages) > > > I would like to first turn matrix A into matrix B > > And then I would like to convert matrix B back again to the original matrix > A. (I have left out details of steps) but this is the gist of what I want to > do. Can anyone please give any insights? > > > Thanks > > > > > > > > > > http://r.789695.n4.nabble.com/file/n2234852/untitled.bmp > > -- > View this message in context: > http://r.789695.n4.nabble.com/Matrix-interesting-question-tp2234852p2234852.html > Sent from the R help mailing list archive at Nabble.com. > > [[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. > -- Joshua Wiley Senior in Psychology University of California, Riverside http://www.joshuawiley.com/ ______________________________________________ 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.