[R] Multiple logical operations in a subscript

Greg Snow Greg.Snow at imail.org
Fri Sep 19 18:03:45 CEST 2008

Peter showed you the %in% operator, you may also want to look at the subset, transform, with, and within functions for future use as ways to reduce the need to type the name of an object multiple times.

Hope this helps,

Gregory (Greg) L. Snow Ph.D.
Statistical Data Center
Intermountain Healthcare
greg.snow at imail.org

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of Mark Na
> Sent: Thursday, September 18, 2008 6:11 PM
> To: R-help at stat.math.ethz.ch
> Subject: [R] Multiple logical operations in a subscript
> Hello,
> I would like to select cases using multiple logical operations (e.g. X
> or Y or Z) without having to repeat the dataframe$variable within the
> subscript. My working code (with a single logical operator) currently
> looks like this:
> dataframe$newvariable[data$oldvariable=="X"]<-"group1"
> I thought this next line of code might do what I wanted, but it
> doesn't:
> dataframe$newvariable[data$oldvariable=="X" | "Y" | "Z"]<-"group1"
> I'd appreciate any suggestions. I've tried playing around with grep,
> but
> can't make it work.
> Thanks! Mark
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