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

[Bert Gunter]

?nrow

Bert Gunter
Genentech Nonclinical Biostatistics

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On
Behalf Of Federman, Douglas
Sent: Monday, September 14, 2009 9:03 AM
To: Peng Yu; r-help at stat.math.ethz.ch
Subject: Re: [R] How to refer to the last a few rows?

Try the tail() function

-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Peng Yu
Sent: Monday, September 14, 2009 11:32 AM
To: r-help at stat.math.ethz.ch
Subject: [R] How to refer to the last a few rows?

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
the last 2 rows?

Regards,
Peng

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______________________________________________
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.