[R] How to refer to the last a few rows?

[Giovanni Petris]

> Date: Mon, 14 Sep 2009 10:32:09 -0500
> From: Peng Yu <pengyu.ut at gmail.com>
> 
> Hi,
> 
> x=matrix(1:60,nr=6)
> 
> I can refer the last 2 rows by
> x[5:6,]
> 
> If I don't know the total number of rows is 6, is there a way to refer

But R does known the total number of rows: it's NROW(x) -- or nrow(x)
if you are sure 'x' is a matrix


HTH,
Giovanni 

> the last 2 rows?
> 
> Regards,
> Peng
> 
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-- 

Giovanni Petris  <GPetris at uark.edu>
Associate Professor
Department of Mathematical Sciences
University of Arkansas - Fayetteville, AR 72701
Ph: (479) 575-6324, 575-8630 (fax)
http://definetti.uark.edu/~gpetris/