See Circle 8.1.3 of 'The R Inferno'.
http://www.burns-stat.com/documents/books/the-r-inferno/
Pat
On 28/09/2013 16:18, rafae...@poczta.fm wrote:
Hi All,
I am using Rx64 3.0.1 on Windows 7 x64, and wanted to get two last rows from
dataset. First, I tried
library(datasets)
data<-airquality
data[nrow(data)-1:nrow(data),]
and received 152 rows sorted desc. Could you explain why it worked this way? I
changed the extract line to:
data[(nrow(data)-1):nrow(data),]
and then I received what I wanted but still am curious about the performance of
my previous code.
Yours faithfully,
Rafał
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--
Patrick Burns
pbu...@pburns.seanet.com
twitter: @burnsstat @portfolioprobe
http://www.portfolioprobe.com/blog
http://www.burns-stat.com
(home of:
'Impatient R'
'The R Inferno'
'Tao Te Programming')
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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.
