[R] truncating a data frame based on a function

[Greg Snow]

Look at the subset function (?subset), it may do what you want.

-- 
Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at intermountainmail.org
(801) 408-8111
 
 

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Faheem Mitha
> Sent: Friday, September 21, 2007 9:24 AM
> To: r-help at r-project.org
> Subject: [R] truncating a data frame based on a function
> 
> 
> Hi,
> 
> Consider the following example.
> 
> > a = c(1,2,3); b = c(4,5,6); c = cbind(a,b); c[(2 < c[,1]) & 
> (c[,1] < 
> > 4),]
> 
> a b
> 3 6
> 
> So, the idea is to select rows for which the value in the 
> first column is between 2 and 4. This works, however, I don't 
> like having to reference a explicitly in this fashion, and 
> just wondered if there was a preferred way to accomplish the 
> same thing. Ideally, I'd like to make use of a function.
> 
>                                                             
> Thanks, Faheem.
> 
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