Hi On 25 Jan 2007 at 10:44, Marc Schwartz wrote:
From: Marc Schwartz <[EMAIL PROTECTED]> To: ablukacz <[EMAIL PROTECTED]> Date sent: Thu, 25 Jan 2007 10:44:18 -0600 Copies to: r-help@stat.math.ethz.ch Subject: Re: [R] subscripting issues Send reply to: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> <mailto:[EMAIL PROTECTED]> > On Thu, 2007-01-25 at 11:04 -0500, ablukacz wrote: > > Dear All, > > > > I have a very simple problem. > > I have a matrix called Predictors with headers X0...X24 > > >dim(Predictors) > > [1] 79 25 > > > > Predictors > > X0 X1 X2 X3 X4 X5 > > X6 > > 1 13.741200 12.148036 11.909435 11.671669 11.238207 10.864697 > > 10.566351 2 10.240200 11.883900 11.529400 11.515050 11.411640 > > 11.105800 10.813457 > > > > > > > > I would like to take each row and all the corresponding columns with > > out the header. I tried Predictors[1,1:25] but that retains the > > headers. > > > > > > Any suggestions. > > > > Thanks, > > > > Agnes > > The column names of X0, etc. suggest that Predictors is a data frame > created by the use of one of the read.table() family of functions, not although you are probably right, it could be matrix as well > is.data.frame(zeta) [1] TRUE > is.matrix(zeta) [1] FALSE > > zetam<-as.matrix(zeta) > zetam tepl tio2 al2o3 iep 1 60 1 3.5 5.65 2 60 1 2.0 5.00 3 60 0 3.5 5.30 4 60 0 2.0 4.65 5 40 1 3.5 5.20 6 40 1 2.0 4.85 7 40 0 3.5 5.70 8 40 0 2.0 5.25 > is.matrix(zetam) [1] TRUE > is.data.frame(zetam) [1] FALSE Cheers Petr > a matrix. An important difference depending upon what you intend to do > with the data. > > However, in both cases, you can generally manipulate the data as if > the headers were not present. In other words, most R functions will > take the numeric values and act in a predictable (sorry for the pun) > fashion. > > Think of the output above as if the column names X0 through X6 were A > through G in a spreadsheet. They are simply labels, not part of the > data itself. The same goes for the row names of 1 and 2. > > HTH, > > Marc Schwartz > > ______________________________________________ > R-help@stat.math.ethz.ch 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. Petr Pikal [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch 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.