[R] data frame is killing me! help

[bbslover]

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?
> 
> 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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> PLEASE do read the posting guide
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> 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?


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