Re: [R] same random numbers in different sessions
Dear all Thanks for all the pointers. On Sat, Oct 9, 2010 at 11:39 PM, Daniel Nordlund djnordl...@frontier.com wrote: Could you be reloading a workspace at start-up that is setting the seed? What happens if you start R using the --vanilla option? It seems that this is the culprit. For some reason, my $HOME session already has ls(all=T) [1] .Random.seed If I open a session in /tmp, or using --vanilla then I get actual pseudo-random numbers. It seems that require(IPSUR) is not at fault, either. Regards Liviu __ 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] same random numbers in different sessions
Hello On Sun, Oct 10, 2010 at 1:16 AM, jim holtman jholt...@gmail.com wrote: You need to set the set.seed yourself. There are some simulation where I do want the same numbers generated and can use the set.seed to set it to a know value. If you want something random each time, then use the time of day in the call to set.seed. I try to do this, but I get funny results. I put try(rm(.Random.seed)) set.seed(Sys.time()) in /usr/lib/R/etc/Rprofile.site but I get the following error Error in rm(.Random.seed) : cannot remove variables from base namespace [Previously saved workspace restored] and it is as if the set.seed() call didn't work, since I get the same random values. rnorm(1:10) [1] -1.3618103 0.4241701 1.0720076 0.2208145 -0.5375314 -0.4846588 [7] 0.7576768 0.6527407 -0.6868786 0.8718527 If I do set.seed(Sys.time()) rnorm(1:10) [1] -0.6165650 0.6305187 -0.9316815 0.6034638 -0.8593514 -1.0243644 [7] -0.1050344 0.4408562 -0.3466161 0.4058430 manually, within the session, the seed seems to be changed as requested. Am I doing something wrong? Liviu __ 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] same random numbers in different sessions
On 10/10/2010 4:30 AM, Liviu Andronic wrote: Hello On Sun, Oct 10, 2010 at 1:16 AM, jim holtman jholt...@gmail.com wrote: You need to set the set.seed yourself. There are some simulation where I do want the same numbers generated and can use the set.seed to set it to a know value. If you want something random each time, then use the time of day in the call to set.seed. I try to do this, but I get funny results. I put try(rm(.Random.seed)) set.seed(Sys.time()) in /usr/lib/R/etc/Rprofile.site but I get the following error Error in rm(.Random.seed) : cannot remove variables from base namespace [Previously saved workspace restored] and it is as if the set.seed() call didn't work, since I get the same random values. rnorm(1:10) [1] -1.3618103 0.4241701 1.0720076 0.2208145 -0.5375314 -0.4846588 [7] 0.7576768 0.6527407 -0.6868786 0.8718527 If I do set.seed(Sys.time()) rnorm(1:10) [1] -0.6165650 0.6305187 -0.9316815 0.6034638 -0.8593514 -1.0243644 [7] -0.1050344 0.4408562 -0.3466161 0.4058430 manually, within the session, the seed seems to be changed as requested. Am I doing something wrong? The Rprofile.site is being executed before the saved workspace is restored. See ?Startup for the sequence of events on startup. You could put the rm() in .First() in the saved workspace and it would do what you want. But more generally, I would say the thing you are doing wrong is saving .RData sometimes, but not consistently saving it. In my opinion it's safest to never save it; then you won't recover unexpected things from your history. But it's also safe to always save it. Then you'll get a new copy of .Random.seed saved each time. I think the q() function makes it a little too easy to do what you did: if you intend to never save it, but answer Yes just once, you get into your situation. I don't know what the alternative should be. One possibility would be for R to record whether the workspace was restored at the start of the session, and use that to determine the default when ending it. But that would mess up people who are trying to reproduce things from identical conditions, e.g. when tracking down a bug. Duncan Murdoch __ 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] same random numbers in different sessions
Dear all I'm using Xubuntu Lucid and I keep getting the same random numbers whenever I start a new session of R. For example, I keep getting sample(1:1000, 1) [1] 87 or rnorm(1:10) [1] -1.3618103 0.4241701 1.0720076 0.2208145 -0.5375314 -0.4846588 [7] 0.7576768 0.6527407 -0.6868786 0.8718527 I expected that some set.seed() instruction woudl be present in a config file in /usr/lib/R/etc/ but after grepping the only reference came out in Rprofile.site and it was commented out: # set.seed(1234) What else could be causing this? Regards Liviu sessionInfo() R version 2.11.1 (2010-05-31) x86_64-pc-linux-gnu locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=en_US.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] fortunes_1.4-0 sos_1.3-0 brew_1.0-3 IPSUR_1.1 -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail __ 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] same random numbers in different sessions
-Original Message- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of Liviu Andronic Sent: Saturday, October 09, 2010 2:15 PM To: r-help@r-project.org Help Subject: [R] same random numbers in different sessions Dear all I'm using Xubuntu Lucid and I keep getting the same random numbers whenever I start a new session of R. For example, I keep getting sample(1:1000, 1) [1] 87 or rnorm(1:10) [1] -1.3618103 0.4241701 1.0720076 0.2208145 -0.5375314 -0.4846588 [7] 0.7576768 0.6527407 -0.6868786 0.8718527 I expected that some set.seed() instruction woudl be present in a config file in /usr/lib/R/etc/ but after grepping the only reference came out in Rprofile.site and it was commented out: # set.seed(1234) What else could be causing this? Regards Liviu Could you be reloading a workspace at start-up that is setting the seed? What happens if you start R using the --vanilla option? Dan Daniel Nordlund Bothell, WA USA __ 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] same random numbers in different sessions
Dear Liviu, On Sat, Oct 9, 2010 at 5:14 PM, Liviu Andronic landronim...@gmail.com wrote: Dear all I'm using Xubuntu Lucid and I keep getting the same random numbers whenever I start a new session of R. For example, I keep getting sample(1:1000, 1) [1] 87 or rnorm(1:10) [1] -1.3618103 0.4241701 1.0720076 0.2208145 -0.5375314 -0.4846588 [7] 0.7576768 0.6527407 -0.6868786 0.8718527 I expected that some set.seed() instruction woudl be present in a config file in /usr/lib/R/etc/ but after grepping the only reference came out in Rprofile.site and it was commented out: # set.seed(1234) What else could be causing this? Regards Liviu sessionInfo() R version 2.11.1 (2010-05-31) x86_64-pc-linux-gnu locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=en_US.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] fortunes_1.4-0 sos_1.3-0 brew_1.0-3 IPSUR_1.1 I notice that you have the IPSUR package loaded; you know, just a shot in the dark here, but did you try not loading it? I ask because the vignette is built by making a special choice for set.seed, and the workspace that ships with the package might be interacting in an unexpected way. Please let me know if IPSUR is the culprit. Regards, Jay __ 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] same random numbers in different sessions
You need to set the set.seed yourself. There are some simulation where I do want the same numbers generated and can use the set.seed to set it to a know value. If you want something random each time, then use the time of day in the call to set.seed. On Sat, Oct 9, 2010 at 5:14 PM, Liviu Andronic landronim...@gmail.com wrote: Dear all I'm using Xubuntu Lucid and I keep getting the same random numbers whenever I start a new session of R. For example, I keep getting sample(1:1000, 1) [1] 87 or rnorm(1:10) [1] -1.3618103 0.4241701 1.0720076 0.2208145 -0.5375314 -0.4846588 [7] 0.7576768 0.6527407 -0.6868786 0.8718527 I expected that some set.seed() instruction woudl be present in a config file in /usr/lib/R/etc/ but after grepping the only reference came out in Rprofile.site and it was commented out: # set.seed(1234) What else could be causing this? Regards Liviu sessionInfo() R version 2.11.1 (2010-05-31) x86_64-pc-linux-gnu locale: [1] LC_CTYPE=en_US.UTF-8 LC_NUMERIC=C [3] LC_TIME=en_US.UTF-8 LC_COLLATE=en_US.UTF-8 [5] LC_MONETARY=C LC_MESSAGES=en_US.UTF-8 [7] LC_PAPER=en_US.UTF-8 LC_NAME=C [9] LC_ADDRESS=C LC_TELEPHONE=C [11] LC_MEASUREMENT=en_US.UTF-8 LC_IDENTIFICATION=C attached base packages: [1] stats graphics grDevices utils datasets methods base other attached packages: [1] fortunes_1.4-0 sos_1.3-0 brew_1.0-3 IPSUR_1.1 -- Do you know how to read? http://www.alienetworks.com/srtest.cfm http://goodies.xfce.org/projects/applications/xfce4-dict#speed-reader Do you know how to write? http://garbl.home.comcast.net/~garbl/stylemanual/e.htm#e-mail __ 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. -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? __ 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.
