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
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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?
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--
---------------------------------
Don MacQueen
Lawrence Livermore National Laboratory
Livermore, CA, USA
925-423-1062
m...@llnl.gov
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