Roy Mendelssohn wrote: > > Hi All: > > > On Jun 23, 2008, at 9:53 AM, Berend Hasselman wrote: > >> Jeffrey Spies wrote: >>> >>> Hi all, >>> >>> Is there an LR decomposition function in R and, if not, how can we >>> get the >>> non-compact representation of Q from QR decomposition? >>> >>> Thanks, >>> >>> Jeff. >>> >> >> I assume you mean a QR decomposition (I don't know what an LR >> decomposition >> is). >> You can get the answers to your questions by typing >> >> ?qr >> >> and taking it from there (click on qr.Q). >> Search the R help first. >> >> Berend > > LR is the transpose of QR and is used in some system identification > routines (see for example some of the papers by Picci). I don't > know if any of the R routines for system identification have an LR, > but you can do a QR decomposition on the transpose of the matrix. > >
I just did a search for LR decomposition with Google. Interesting: appears to be another name for the LU decomposition. The transpose of a QR decomposition: wouldn't that be an LQ decomposition? Berend -- View this message in context: http://www.nabble.com/LR-Decomposition--tp18072588p18073979.html Sent from the R help mailing list archive at Nabble.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.
