Re: [R] reading only some columns from a table

From: Amir Safari <amsa36060_at_yahoo.com>
Date: Mon 30 Oct 2006 - 10:35:18 GMT

   Thank you so much for reply. I tried to do your suggested idea. It did not work. what could be my mistake ? I got the same result with and without colClasses=c() arguement. What could be the reason? even using header=TRUE the result change slightly but not into desired one.      

Gabor Grothendieck <ggrothendieck@gmail.com> wrote: See the colClasses argument of read.table.

e.g.

   read.table("myfile", header = TRUE, colClasses = c(person = NULL))

assuming you don't want the column labelled person in the header.

On 10/30/06, Amir Safari wrote:
>
>
> Dear R users,
> Sometimes it is needed to read only some columns from a table, in particulare for high frequency data. How it is possible to read just some certain columns using read.table ( ). The reason could be keeping space in R and in particular accelerating in reading data when the number of rows are huge and some of them are not needed.
> Thank you very much,
> Amir
>
>
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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon Oct 30 21:42:48 2006

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