Re: [R] Exporting data to a text file

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Tue, 05 Aug 2008 17:08:36 +0100 (BST)

On Tue, 5 Aug 2008, John Kane wrote:

> Don't worry about the warning. R is just telling you that you're
> appending something :) I'm not sure why it does that. Perhaps just to
> make sure that you know that you reallly want to append ?

Correct: such a file is close to unreadable (e.g. not by read.table) and if you are using this as a way to merge datasets you want to use col.names = FALSE on subsequent calls.

Note that in this case what is being written is not a 'table' at all, but a vector, so write.table(col.names=TRUE) is not really appropriate,

>
>
> --- On Mon, 8/4/08, pacomet <pacomet@gmail.com> wrote:
>
>> From: pacomet <pacomet_at_gmail.com>
>> Subject: Re: [R] Exporting data to a text file
>> To: jrkrideau_at_yahoo.ca
>> Cc: r-help_at_r-project.org
>> Received: Monday, August 4, 2008, 7:03 AM
>> Hi John
>>
>> I don't get an error message but a warning
>>
>>>
>> write.table(myclara$clustering,"cluster.dat",append=TRUE)
>> Warning message:
>> In write.table(myclara$clustering, "cluster.dat",
>> append = TRUE) :
>> appending column names to file
>>>
>>
>> Here it is the output of str(myclara), it looks
>> "strange" to me. I think
>> "clustering" are integers and "data"
>> are real numbers
>>
>>> str(myclara)
>> List of 10
>> $ sample : chr [1:56] "32356"
>> "33277" "43230" "52386" ...
>> $ medoids : num [1:8, 1:14] 7.888 12.019 5.427 0.725
>> 17.688 ...
>> ..- attr(*, "dimnames")=List of 2
>> .. ..$ : chr [1:8] "109056" "98194"
>> "56959" "109806" ...
>> .. ..$ : chr [1:14] "lon" "lat"
>> "sst01" "sst02" ...
>> $ i.med : int [1:8] 20482 16158 5137 20722 48599 56033
>> 68028 64308
>> $ clustering: Named int [1:75459] 1 1 1 1 1 1 1 1 1 1 ...
>> ..- attr(*, "names")= chr [1:75459]
>> "12296" "12297" "12298"
>> "12299" ...
>> $ objective : num 3.22
>> $ clusinfo : num [1:8, 1:4] 15055 9474 5164 13702 11340
>> ...
>> ..- attr(*, "dimnames")=List of 2
>> .. ..$ : NULL
>> .. ..$ : chr [1:4] "size" "max_diss"
>> "av_diss" "isolation"
>> $ diss :Classes 'dissimilarity',
>> 'dist' atomic [1:1540] 1.11 6.54
>> 4.62 3.30 4.32 ...
>> .. ..- attr(*, "Size")= int 56
>> .. ..- attr(*, "Metric")= chr
>> "euclidean"
>> .. ..- attr(*, "Labels")= chr [1:56]
>> "32356" "33277" "43230"
>> "52386" ...
>> $ call : language clara(x = mydata, k = 8)
>> $ silinfo :List of 3
>> ..$ widths : num [1:56, 1:3] 1 1 1 1 1 1 1 1 2 2
>> ...
>> .. ..- attr(*, "dimnames")=List of 2
>> .. .. ..$ : chr [1:56] "96250"
>> "109056" "130058" "116317" ...
>> .. .. ..$ : chr [1:3] "cluster"
>> "neighbor" "sil_width"
>> ..$ clus.avg.widths: num [1:8] 0.343 0.355 0.533 0.265
>> 0.308 ...
>> ..$ avg.width : num 0.362
>> $ data : num [1:75459, 1:14] 8.68 8.72 8.77 8.81 8.86
>> ...
>> ..- attr(*, "dimnames")=List of 2
>> .. ..$ : chr [1:75459] "12296"
>> "12297" "12298" "12299" ...
>> .. ..$ : chr [1:14] "lon" "lat"
>> "sst01" "sst02" ...
>> - attr(*, "class")= chr [1:2] "clara"
>> "partition"
>>
>>
>>
>> I can't output the two variables in two different files
>> without any problem.
>>
>> Thanks
>>
>>
>> 2008/8/1 John Kane <jrkrideau_at_yahoo.ca>
>>
>>> try
>>> str(myclara)
>>> to see what you have - a data frame , matrix etc
>>>
>>> Are you getting any error messages?
>>>
>>> I tried your write.table commands and they work okay.
>>>
>>>
>>> --- On Fri, 8/1/08, pacomet <pacomet_at_gmail.com>
>> wrote:
>>>
>>>> From: pacomet <pacomet_at_gmail.com>
>>>> Subject: [R] Exporting data to a text file
>>>> To: r-help_at_r-project.org
>>>> Received: Friday, August 1, 2008, 12:49 PM
>>>> HI R users
>>>>
>>>> With clara function I get a data frame (maybe
>> this is not
>>>> the exact word,
>>>> I'm new to R) with the following variables:
>>>>
>>>>> names(myclara)
>>>> [1] "sample" "medoids"
>>>> "i.med" "clustering"
>>>> "objective"
>>>> [6] "clusinfo" "diss"
>>>> "call" "silinfo"
>>>> "data"
>>>>
>>>> I want to export "clustering" and
>>>> "data" to a new text file so I try
>>>>
>>>>>
>> write.table(myclara$data,"cluster.dat")
>>>>>
>>>>
>> write.table(myclara$clustering,"cluster.dat",append=TRUE)
>>>>
>>>> Variable data is properly exported but clustering
>> is not
>>>> appended to the
>>>> output file.
>>>>
>>>> Please, where is the mistake? is it possible to
>> export the
>>>> two variables in
>>>> just a sentence?
>>>>
>>>> thanks in advance
>>>>
>>>> Paco
>>>>

>>>> --
>>>> _________________________
>>>> El ponent la mou, el llevant la plou
>>>> Usuari Linux registrat: 363952
>>>> -------
>>>> Fotos: http://picasaweb.google.es/pacomet
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>>>
>>>
>>>
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>> --
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>
>
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-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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