R help - Apr 2011 - writing/appending a text file

Hello

I'm fairly new to R. I have a script which produces a 1-column vector
(numeric). I can write it to a text file using the write command. What I
want to do is to run the script a number of times on different input files,
producing a different 1-column vector each time and save all the vectors to
a text file so that each vector is one separate column in the text file. I
had thought of appending each new vector as a new column in the unique text
file, but I don't know if this is possible.

At the moment, it looks like I will have to create a separate text file each
time I run the script.

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On Apr 22, 2011, at 8:40 AM, PBFrance wrote:
> Hello
>
> I'm fairly new to R. I have a script which produces a 1-column vector
> (numeric). I can write it to a text file using the write command.  
> What I
> want to do is to run the script a number of times on different input  
> files,
> producing a different 1-column vector each time and save all the  
> vectors to
> a text file so that each vector is one separate column in the text  
> file. I
> had thought of
> append    # the obvious parameter to look for
> ing each new vector as a new column in the unique text
> file, but I don't know if this is possible.
If you have further questions after reading these help files and  
setting, append=TRUE, you should offer an example:

?write.table
?cat
>
> At the moment, it looks like I will have to create a separate text  
> file each
> time I run the script.
-- 

David Winsemius, MD
West Hartford, CT

Collect the results in an object via 'cbind' and then write out the
results at the end of the test.  You did not mention how large these
vectors were.  You can 'append' to the end of the file, but you can
not add more columns to an existing file without reading it in,
'cbind'ing and the writing it out.  So it depends on how large your
result will be and if you have to use a relational database if it is
going to be several millions of rows.  A little more specificity would
be good; numbers always make it easier to understand the problem you
are trying to solve.

On Fri, Apr 22, 2011 at 8:40 AM, PBFrance <peter.banton at univmed.fr>
wrote:
> Hello
>
> I'm fairly new to R. I have a script which produces a 1-column vector
> (numeric). I can write it to a text file using the write command. What I
> want to do is to run the script a number of times on different input files,
> producing a different 1-column vector each time and save all the vectors to
> a text file so that each vector is one separate column in the text file. I
> had thought of appending each new vector as a new column in the unique text
> file, but I don't know if this is possible.
>
> At the moment, it looks like I will have to create a separate text file
each
> time I run the script.
>
> --
> View this message in context:
http://r.789695.n4.nabble.com/writing-appending-a-text-file-tp3467882p3467882.html
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
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> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
>


-- 
Jim Holtman
Data Munger Guru

What is the problem that you are trying to solve?