Message-ID: <644e1f320904250452x79ecaf51g4cb9f0a43becb3@mail.gmail.com>
Date: 2009-04-25T11:52:01Z
From: jim holtman
Subject: Reading files
In-Reply-To: <816b5ce40904242346k19641a9dvcf0f4112b25312ca@mail.gmail.com>
On Sat, Apr 25, 2009 at 2:46 AM, Santosh <santosh2005 at gmail.com> wrote:
> Dear R-sians
> Quick question...
>
> 1) From a flat (data) file with 100+ columns, how do I read specific columns
> instead of reading the entire dataset? I am trying to avoid reading the
> entire file followed by "subsetting".
In read.table you can use 'col.classes' to define columns to skp.
>
> 2) is the a way to a call a column of dataframe through a variable.. e.g.
>
> e,g
> var="date"
>
> something like...
> data${var} <- "02 Oct 2009?
data[[var]] <- "02Oct 2009"
>
> Regards,
> santosh
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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>
--
Jim Holtman
Cincinnati, OH
+1 513 646 9390
What is the problem that you are trying to solve?