I have try it, past can add to wanted letter, but can not past the colume names. May be I should learn it hard.
Don MacQueen wrote: > > At 4:57 AM -0700 10/23/09, bbslover wrote: >>Steve Lianoglou-6 wrote: >>> >>> Hi, >>> >>> On Oct 22, 2009, at 2:35 PM, bbslover wrote: >>> >>>> Usage >>>> data(gasoline) >>>> Format >>>> A data frame with 60 observations on the following 2 variables. >>>> octane >>>> a numeric vector. The octane number. >>>> NIR >>>> a matrix with 401 columns. The NIR spectrum >>>> >>>> and I see the gasoline data to see below >>>> NIR.1686 nm NIR.1688 nm NIR.1690 nm NIR.1692 nm NIR.1694 nm NIR.1696 >>>> nm >>>> NIR.1698 nm NIR.1700 nm >>>> 1 1.242645 1.250789 1.246626 1.250985 1.264189 1.244678 1.245913 >>>> 1.221135 >>>> 2 1.189116 1.223242 1.253306 1.282889 1.215065 1.225211 1.227985 >>>> 1.198851 >>>> 3 1.198287 1.237383 1.260979 1.276677 1.218871 1.223132 1.230321 >>>> 1.208742 >>>> 4 1.201066 1.233299 1.262966 1.272709 1.211068 1.215044 1.232655 >>>> 1.206696 >>>> 5 1.259616 1.273713 1.296524 1.299507 1.226448 1.230718 1.232864 >>>> 1.202926 >>>> 6 1.24109 1.262138 1.288401 1.291118 1.229769 1.227615 1.22763 >>>> 1.207576 >>>> 7 1.245143 1.265648 1.274731 1.292441 1.218317 1.218147 1.222273 >>>> 1.200446 >>>> 8 1.222581 1.245782 1.26002 1.290305 1.221264 1.220265 1.227947 >>>> 1.188174 >>>> 9 1.234969 1.251559 1.272416 1.287405 1.211995 1.213263 1.215883 >>>> 1.196102 >>>> >>>> look at this NIR.1686 nm NIR.1688 nm NIR.1690 nm NIR.1692 nm NIR. >>>> 1694 nm >>>> NIR.1696 nm NIR.1698 nm NIR.1700 nm >>>> >>>> how can I add letters NIR to my variable, because my 600 >>>> independents never >>>> have NIR as the prefix. however, it is needed to model the plsr. for >>>> example aa=plsr(y~NIR, data=data ,....), the prefix NIR is >>>> necessary, how >> >> can I do with it? > > Perhaps using paste(). Maybe something like: > > paste('NIR', 1:600,sep=''.) > or > paste('NIR', seq(1686,1700,2),sep='.') > >> > >>> I'm not really sue that I'm getting you, but if your problem is that >>> the column names of your data.frame don't match the variable names >>> you'd like to use in your formula, just change the colnames of your >>> data.frame to match your formula. >>> >>> BTW - I have no idea where to get this gasoline data set, so I'm just >>> imagining: >>> >>> eg. >>> colnames(gasoline) <- c('put', 'the', 'variable', 'names', 'that', >>> 'you', 'want', 'here') >>> >>> -steve >>> >>> -- >>> Steve Lianoglou >>> Graduate Student: Computational Systems Biology >>> | Memorial Sloan-Kettering Cancer Center >>> | Weill Medical College of Cornell University >>> Contact Info: http://*cbio.mskcc.org/~lianos/contact >>> >>> ______________________________________________ >>> 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. >>> >>> >> >>thanks for you. but the numbers of indenpendence are so many, it is not easy >>to identify them one by one, is there some better way? >> >> >>-- >>View this message in context: >>http://*www.*nabble.com/data-frame-is-killing-me%21-help-tp26015079p26024985.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. > > > -- > --------------------------------- > Don MacQueen > Lawrence Livermore National Laboratory > Livermore, CA, USA > 925-423-1062 > m...@llnl.gov > > ______________________________________________ > 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. > > -- View this message in context: http://www.nabble.com/data-frame-is-killing-me%21-help-tp26015079p26036875.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.