Does anyone know why this is happening? Which() is picking up the indices of the numbers 13 and 15 in neilist, but it's missing out the 13 at index 6. Thank you, Thomas Chesney > neilist [1] 13 15 28 29 30 13 14 15 28 30 43 44 45 14 15 29 44 45 > pfriends [1] 13 15 > which(neilist==pfriends) [1] 1 2 8 > neilist[6] [1] 13 > str(neilist) int [1:18] 13 15 28 29 30 13 14 15 28 30 ... > str(pfriends) num [1:2] 13 15 > sessionInfo() R version 2.15.3 (2013-03-01) Platform: i386-apple-darwin9.8.0/i386 (32-bit) locale: [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8 attached base packages: [1] splines grid stats graphics grDevices utils datasets methods [9] base other attached packages: [1] spdep_0.5-56 coda_0.16-1 deldir_0.0-21 maptools_0.8-23 foreign_0.8-52 [6] nlme_3.1-108 MASS_7.3-23 Matrix_1.0-11 lattice_0.20-13 boot_1.3-7 [11] sp_1.0-8 igraph_0.6.5-1 loaded via a namespace (and not attached): [1] LearnBayes_2.12 tools_2.15.3 This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it. Please do not use, copy or disclose the information contained in this message or in any attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. This message has been checked for viruses but the contents of an attachment may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation.
I think you want to do which(neilist %in% pfriends) -----Original Message----- From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Thomas Sent: Tuesday, March 18, 2014 6:14 AM To: r-help at r-project.org Subject: [R] Which() missing a number Does anyone know why this is happening? Which() is picking up the indices of the numbers 13 and 15 in neilist, but it's missing out the 13 at index 6. Thank you, Thomas Chesney > neilist [1] 13 15 28 29 30 13 14 15 28 30 43 44 45 14 15 29 44 45 > pfriends [1] 13 15 > which(neilist==pfriends) [1] 1 2 8 > neilist[6] [1] 13 > str(neilist) int [1:18] 13 15 28 29 30 13 14 15 28 30 ... > str(pfriends) num [1:2] 13 15 > sessionInfo() R version 2.15.3 (2013-03-01) Platform: i386-apple-darwin9.8.0/i386 (32-bit) locale: [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8 attached base packages: [1] splines grid stats graphics grDevices utils datasets methods [9] base other attached packages: [1] spdep_0.5-56 coda_0.16-1 deldir_0.0-21 maptools_0.8-23 foreign_0.8-52 [6] nlme_3.1-108 MASS_7.3-23 Matrix_1.0-11 lattice_0.20-13 boot_1.3-7 [11] sp_1.0-8 igraph_0.6.5-1 loaded via a namespace (and not attached): [1] LearnBayes_2.12 tools_2.15.3 This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it. Please do not use, copy or disclose the information contained in this message or in any attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. This message has been checked for viruses but the contents of an attachment may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation. ______________________________________________ R-help at 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.
... and it is also missing the 15 at position 15.
Can't explain but
> which( neilist %in% pfriends )
should give you what you want.
On Tuesday 18 March 2014 11:14:08 Thomas wrote:> Does anyone know why this is happening? Which() is picking up the
> indices of the numbers 13 and 15 in neilist, but it's missing out the
> 13 at index 6.
>
> Thank you,
>
> Thomas Chesney
>
> > neilist
> [1] 13 15 28 29 30 13 14 15 28 30 43 44 45 14 15 29 44 45
>
> > pfriends
> [1] 13 15
>
> > which(neilist==pfriends)
> [1] 1 2 8
>
> > neilist[6]
> [1] 13
>
> > str(neilist)
> int [1:18] 13 15 28 29 30 13 14 15 28 30 ...
>
> > str(pfriends)
> num [1:2] 13 15
>
> > sessionInfo()
> R version 2.15.3 (2013-03-01)
> Platform: i386-apple-darwin9.8.0/i386 (32-bit)
>
> locale:
> [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8
>
> attached base packages:
> [1] splines grid stats graphics grDevices utils
> datasets methods
> [9] base
>
> other attached packages:
> [1] spdep_0.5-56 coda_0.16-1 deldir_0.0-21 maptools_0.8-23
> foreign_0.8-52
> [6] nlme_3.1-108 MASS_7.3-23 Matrix_1.0-11 lattice_0.20-13
> boot_1.3-7
> [11] sp_1.0-8 igraph_0.6.5-1
>
> loaded via a namespace (and not attached):
> [1] LearnBayes_2.12 tools_2.15.3
>
> This message and any attachment are intended solely for the addressee and
may contain confidential information. If you have received this message in
error, please send it back to me, and immediately delete it. Please do not
use, copy or disclose the information contained in this message or in any
attachment. Any views or opinions expressed by the author of this email do not
necessarily reflect the views of the University of Nottingham.
>
> This message has been checked for viruses but the contents of an attachment
> may still contain software viruses which could damage your computer system,
you are advised to perform your own checks. Email communications with the
University of Nottingham may be monitored as permitted by UK legislation.
>
> ______________________________________________
> R-help at 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.
On 18/03/2014 7:14 AM, Thomas wrote:> Does anyone know why this is happening? Which() is picking up the > indices of the numbers 13 and 15 in neilist, but it's missing out the > 13 at index 6. > > Thank you, > > Thomas Chesney > > > neilist > [1] 13 15 28 29 30 13 14 15 28 30 43 44 45 14 15 29 44 45 > > > pfriends > [1] 13 15 > > > which(neilist==pfriends) > [1] 1 2 8Two problems with your code. The first is recycling. Your expression neilist == pfriends compares neilist[1] with pfriends[1], then neilist[2] with pfriends[2], then neilist[3] with pfriends[1], etc. The second problem is that pfriends is not an integer vector, so it may actually contain 13.00000000001 and 14.9999999999 (or similar numbers that round to 13 and 15 when printed), and those won't test equal to 13 and 15. Duncan Murodch> > > neilist[6] > [1] 13 > > > str(neilist) > int [1:18] 13 15 28 29 30 13 14 15 28 30 ... > > > str(pfriends) > num [1:2] 13 15 > > > sessionInfo() > R version 2.15.3 (2013-03-01) > Platform: i386-apple-darwin9.8.0/i386 (32-bit) > > locale: > [1] en_GB.UTF-8/en_GB.UTF-8/en_GB.UTF-8/C/en_GB.UTF-8/en_GB.UTF-8 > > attached base packages: > [1] splines grid stats graphics grDevices utils > datasets methods > [9] base > > other attached packages: > [1] spdep_0.5-56 coda_0.16-1 deldir_0.0-21 maptools_0.8-23 > foreign_0.8-52 > [6] nlme_3.1-108 MASS_7.3-23 Matrix_1.0-11 lattice_0.20-13 > boot_1.3-7 > [11] sp_1.0-8 igraph_0.6.5-1 > > loaded via a namespace (and not attached): > [1] LearnBayes_2.12 tools_2.15.3 > > This message and any attachment are intended solely for the addressee and may contain confidential information. If you have received this message in error, please send it back to me, and immediately delete it. Please do not use, copy or disclose the information contained in this message or in any attachment. Any views or opinions expressed by the author of this email do not necessarily reflect the views of the University of Nottingham. > > This message has been checked for viruses but the contents of an attachment > may still contain software viruses which could damage your computer system, you are advised to perform your own checks. Email communications with the University of Nottingham may be monitored as permitted by UK legislation. > > ______________________________________________ > R-help at 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.