[R] selecting by variable

[Hotz, T.]

Eugene,

R allows indexing with logical vectors, so your example would look
like

hist(X[(Y>=A) & (Y<=B)])

See the manual "An Introduction to R" for details.

HTH

Thomas

> -----Original Message-----
> From: Eugene Salinas [mailto:eugenesalinas2003 at yahoo.com]
> Sent: 27 August 2003 09:49
> To: r-help at stat.math.ethz.ch
> Subject: [R] selecting by variable
> 
> 
> Hi,
> 
> I'm a recent R convert so I haven't quite figured out
> the details yet...
> 
> How do I select one variable by another one? Ie if I
> want to draw the histogram of variable X only for
> those individuals that also have a value Y in a
> certain range?
> 
> In STATA I would give something like:
> 
> histogram X if ((Y>=A & Y<=B))
> 
> (The data is for individuals and each individual has a
> number of characteristics including X and Y).
> 
> thanks, eugene.
> 
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://www.stat.math.ethz.ch/mailman/listinfo/r-help
> 

---

Thomas Hotz
Research Associate in Medical Statistics
University of Leicester
United Kingdom

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