[R] Creating data frame from existing data frame

Peter Alspach PAlspach at hortresearch.co.nz
Fri Sep 12 06:53:10 CEST 2008


You are wanting to subset the data so try help(subset) or ?subset. And
follow the See also which refers to '['.  You might also find the
introductory manual helpful.  Most of the contributed documentation on
CRAN (the comprehensive R archive network) will cover this with
examples.  I found Patrick Burns' 'S-poetry' particularly helpful when I
started - although I don't think he has been updating it, it'll still be
relevant in this context.

I hope this is more helpful than simply supplying the answer.

Peter Alspach

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of 2k3autococker
> Sent: Friday, 12 September 2008 3:57 p.m.
> To: r-help at r-project.org
> Subject: [R] Creating data frame from existing data frame
> I'm new to R, using it for an engineering stats class, and 
> the first project is focused on creating data frames and 
> plotting graphs. So far I have imported a set of data from a 
> text file and saved it as a variable (using the read.table() 
> function). One of the columns of the data consists of years, 
> and I'm supposed to create a data frame that only consists 
> the the date from one given year (ie. I need to scan the Year 
> column, pick out the specific year, and include those rows). 
> I'm pretty sure I have to use
> data.frame() to do this, but I don't know what arguments 
> would pick out rows from a particular year (and keep the 
> headers of the columns intact in the new data frame). Beyond 
> this, I need to plot it and export it to an image file, which 
> I can do myself.
> Can someone please tell me the arguments to data.frame() that 
> would achieve this (or better yet, point me to a good list of 
> functions and arguments in addition to this).
> Thanks for your help,
> Josh
> --
> View this message in context: 
> http://www.nabble.com/Creating-data-frame-from-existing-data-f
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