[R] data frame is killing me! help

[Steve Lianoglou]

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?

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