[R] longer object length is not a multiple of shorter object length
In datamatrix[, y] == datamatrix[, y][-1] : longer object length is not a multiple of shorter object length out = c(FALSE,datamatrix[,'y'] == datamatrix[,'y'][-1]) and I do not know why I get that error, the resulting out matrix is somehow one row larger than datamatrix... all I try to do is filter matrix by dropping rows where [,'y'][-1] == [,'y'][+1] -- View this message in context: http://r.789695.n4.nabble.com/longer-object-length-is-not-a-multiple-of-shorter-object-length-tp3077400p3077400.html Sent from the R help mailing list archive at Nabble.com. __ 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] longer object length is not a multiple of shorter object length
Hi, On Tue, Dec 7, 2010 at 3:01 PM, madr madra...@interia.pl wrote: In datamatrix[, y] == datamatrix[, y][-1] : suppose datamatrix has 10 rows, you select column y, and then for the equality remove the first 'row' (technically element at this point since you selected just column y). So R is being asked to try to compare rows 1 through 10 with rows 2 through 10 hence: longer object length is not a multiple of shorter object length out = c(FALSE,datamatrix[,'y'] == datamatrix[,'y'][-1]) and I do not know why I get that error, the resulting out matrix is somehow one row larger than datamatrix... all I try to do is filter matrix by dropping rows where [,'y'][-1] == [,'y'][+1] perhaps you want to compare rows 1 through 9 with 2 through 10? That is, see if there are any differences? Following through wtih there being 10 rows, you could remove the last one (replacing 10 with however many you actually have): datamatrix[, y][-10] == datamatrix[, y][-1] or alternately you might look at the ?diff function: diff(datamatrix[, y]) which will calculate differences based on the set lag (1 by default). It seems like you might be interested in something like that. Cheers, Josh -- View this message in context: http://r.789695.n4.nabble.com/longer-object-length-is-not-a-multiple-of-shorter-object-length-tp3077400p3077400.html Sent from the R help mailing list archive at Nabble.com. __ 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. -- Joshua Wiley Ph.D. Student, Health Psychology University of California, Los Angeles http://www.joshuawiley.com/ __ 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] longer object length is not a multiple of shorter object length
-Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r- project.org] On Behalf Of madr Sent: Tuesday, December 07, 2010 3:02 PM To: r-help@r-project.org Subject: [R] longer object length is not a multiple of shorter object length In datamatrix[, y] == datamatrix[, y][-1] : longer object length is not a multiple of shorter object length out = c(FALSE,datamatrix[,'y'] == datamatrix[,'y'][-1]) and I do not know why I get that error, the resulting out matrix is somehow one row larger than datamatrix... all I try to do is filter matrix by dropping rows where [,'y'][-1] == [,'y'][+1] If I understand what you want correctly, something like this may give you what you want # create data fraome to work with x - 1:10 y - c(2, 2, 4, 3, 5, 5, 4, 1, 2, 5) df - data.frame(x,y) # out contains rows to drop out out - which(c(FALSE, df[-1,'y'] == df[-nrow(df), 'y'])) df[-out,] # keep contains rows to keep keep - which(c(TRUE, df[-1,'y'] != df[-nrow(df), 'y'])) df[keep,] Hope this is helpful, Dan Daniel J. Nordlund Washington State Department of Social and Health Services Planning, Performance, and Accountability Research and Data Analysis Division Olympia, WA 98504-5204 __ 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] longer object length is not a multiple of shorter object length
Hi folks, I'm following An Introduction to R http://cran.r-project.org/doc/manuals/R-intro.html#R-and-statistics to learn R. Coming to; 2.2 Vector arithmetic v - 2*x + y + 1 Warning message: In 2 * x + y : longer object length is not a multiple of shorter object length What does it mean? How to rectify it? Please help. TIA B.R. Stephen L __ 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] longer object length is not a multiple of shorter object length
On Nov 3, 2010, at 11:00 AM, Stephen Liu wrote: Hi folks, I'm following An Introduction to R http://cran.r-project.org/doc/manuals/R-intro.html#R-and-statistics to learn R. Coming to; 2.2 Vector arithmetic v - 2*x + y + 1 Warning message: In 2 * x + y : longer object length is not a multiple of shorter object length What does it mean? How to rectify it? Please help. TIA What does this return: c(length(x), length(y)) # ? David Winsemius, MD West Hartford, CT __ 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] longer object length is not a multiple of shorter object length
- Original Message From: David Winsemius dwinsem...@comcast.net To: Stephen Liu sati...@yahoo.com Cc: r-help@r-project.org Sent: Wed, November 3, 2010 11:03:18 PM Subject: Re: [R] longer object length is not a multiple of shorter object length - snip - v - 2*x + y + 1 Warning message: In 2 * x + y : longer object length is not a multiple of shorter object length What does it mean? How to rectify it? Please help. TIA What does this return: c(length(x), length(y)) # ? c(length(x), length(y)) [1] 5 11 B.R. Stephen L __ 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] longer object length is not a multiple of shorter object length
On Nov 3, 2010, at 11:17 AM, Stephen Liu wrote: - Original Message From: David Winsemius dwinsem...@comcast.net To: Stephen Liu sati...@yahoo.com Cc: r-help@r-project.org Sent: Wed, November 3, 2010 11:03:18 PM Subject: Re: [R] longer object length is not a multiple of shorter object length - snip - v - 2*x + y + 1 Warning message: In 2 * x + y : longer object length is not a multiple of shorter object length What does it mean? How to rectify it? You were not supposed to rectify it. That example was designed to show you what happens in R when two vectors (actually three) are offered to the Arithmetic operators. Read the material that is above and below that expression again. Please help. TIA What does this return: c(length(x), length(y)) # ? c(length(x), length(y)) [1] 5 11 B.R. Stephen L David Winsemius, MD West Hartford, CT __ 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.
