Hi everyone, I asked myself if exists a way to get a rows (or columns) matrix reduction with R. My goal is for education. Thanks in advance AS
Incomprehensible. Define:"matrix reduction" . Perhaps: ?qr ?svd ## and links therein. -- Bert On Sat, Apr 6, 2013 at 10:43 AM, Angelo Scozzarella Tiscali <angeloscozzarella at tiscali.it> wrote:> Hi everyone, > > I asked myself if exists a way to get a rows (or columns) matrix reduction with R. > My goal is for education. > > Thanks in advance > > AS > ______________________________________________ > R-help at 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.-- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm
Well, I mean to use the elimination method to transform the matrix, for example, of the coefficients of a linear equations system. AS Il giorno 06/apr/2013, alle ore 19:43, Angelo Scozzarella Tiscali ha scritto:> Hi everyone, > > I asked myself if exists a way to get a rows (or columns) matrix reduction with R. > My goal is for education. > > Thanks in advance > > AS > ______________________________________________ > R-help at 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.
On 06-04-2013, at 19:58, Angelo Scozzarella Tiscali <angeloscozzarella at tiscali.it> wrote:> Well, I mean to use the elimination method to transform the matrix, for example, of the coefficients of a linear equations system. > > AS >Well if you only need to solve a linear equation system have a look at solve. If you have a special system (banded,tridiagonal) then limSolve may help. If you need the LU decomposition itself use package Matrix and look at denseLU. Berend
?chol ##also -- Bert On Sat, Apr 6, 2013 at 11:12 AM, Berend Hasselman <bhh at xs4all.nl> wrote:> > On 06-04-2013, at 19:58, Angelo Scozzarella Tiscali <angeloscozzarella at tiscali.it> wrote: > >> Well, I mean to use the elimination method to transform the matrix, for example, of the coefficients of a linear equations system. >> >> AS >> > > > Well if you only need to solve a linear equation system have a look at solve. > If you have a special system (banded,tridiagonal) then limSolve may help. > If you need the LU decomposition itself use package Matrix and look at denseLU. > > Berend > > ______________________________________________ > R-help at 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.-- Bert Gunter Genentech Nonclinical Biostatistics Internal Contact Info: Phone: 467-7374 Website: http://pharmadevelopment.roche.com/index/pdb/pdb-functional-groups/pdb-biostatistics/pdb-ncb-home.htm