Re: [R] Strange result from single [] extract operator
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 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- 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') __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Strange result from single [] extract operator
Dear All, thank you for all answers. First answer helped me understand the performance of code better, second showed me how to solve the problem easier and third provided me with interesting pdf to learn. I am very grateful for your help. Best regards, Rafa³ 2013/9/29 Patrick Burns pbu...@pburns.seanet.com See Circle 8.1.3 of 'The R Inferno'. http://www.burns-stat.com/**documents/books/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, Rafa³ __** R-help@r-project.org mailing list https://stat.ethz.ch/mailman/**listinfo/r-helphttps://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/** posting-guide.html http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Patrick Burns pbu...@pburns.seanet.com twitter: @burnsstat @portfolioprobe http://www.portfolioprobe.com/**blog http://www.portfolioprobe.com/blog http://www.burns-stat.com (home of: 'Impatient R' 'The R Inferno' 'Tao Te Programming') [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] Strange result from single [] extract operator
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 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] Strange result from single [] extract operator
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. Back up a little and compare nrow(data)-1:nrow(data) to (nrow(data)-1):nrow(data) or compare 3-1:3 to (3-1):3 Then look at the help file for Syntax. Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com -Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of rafae...@poczta.fm Sent: Saturday, September 28, 2013 8:18 AM To: r-help@r-project.org Subject: [R] Strange result from single [] extract operator 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 __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
