Hi all, I am running a simulation and a curious error keeps coming up that stops the whole process. The error is a subscript out of bounds error, and it seems to happen at different points (floating around) throughout the looping simulation. Say, for example, it crashes on sample 1 - iteration 200. I can force it to start again on iteration 202 with all of the same settings, and it is fine. I can also force it to start again on iteration 201 if I modify the starting seed value and it goes on its merry way. What I think is happening is that certain seed values are disrupting something and causing the subscript error. My seeds are set as follows: The simulation has x number of conditions. The starting seeds are set to equal the condition number (1 to x). The program runs 500 iterations within each condition, and the seed values for each iteration are set as x+iteration number. So, for condition 1, iteration 1, the starting seed value would be 2, then 3 etc. etc. At some point, I will get the subscript error but it seems unpredictable. Has anyone had a similar problem or an idea as to what might be happening? - Brendan Brendan Morse, M.S. Industrial/Organizational Psychology Ohio University Office: 335 Porter Hall Website: http://oak.cats.ohiou.edu/~bm123504 [[alternative HTML version deleted]]
?traceback
options("error") ( ?options)
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R has facilities to help you with such problems. Please use them -- and then
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-- Bert Gunter
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On
Behalf Of Brendan Morse
Sent: Thursday, April 23, 2009 9:12 AM
To: r-help at r-project.org
Subject: [R] Floating simulation error
Hi all, I am running a simulation and a curious error keeps coming up
that stops the whole process. The error is a subscript out of bounds
error, and it seems to happen at different points (floating around)
throughout the looping simulation. Say, for example, it crashes on
sample 1 - iteration 200. I can force it to start again on iteration
202 with all of the same settings, and it is fine. I can also force it
to start again on iteration 201 if I modify the starting seed value
and it goes on its merry way. What I think is happening is that
certain seed values are disrupting something and causing the subscript
error.
My seeds are set as follows: The simulation has x number of
conditions. The starting seeds are set to equal the condition number
(1 to x). The program runs 500 iterations within each condition, and
the seed values for each iteration are set as x+iteration number. So,
for condition 1, iteration 1, the starting seed value would be 2, then
3 etc. etc. At some point, I will get the subscript error but it seems
unpredictable.
Has anyone had a similar problem or an idea as to what might be
happening?
- Brendan
Brendan Morse, M.S.
Industrial/Organizational Psychology
Ohio University
Office: 335 Porter Hall
Website: http://oak.cats.ohiou.edu/~bm123504
[[alternative HTML version deleted]]
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Cosmic rays, perhaps? :) http://blog.revolution-computing.com/2009/04/blame-it-on-cosmic-rays.html Seriously though, my guess is that the simulation data from your 201st iteration is tickling some subtle bug in your code. This has happened to me before where I generate a random matrix that happens to be non-invertible, for example. I'd suggest grabbing the data from your 201st iteration (a simple way would be to run your RNG 200 times at the start of your code) and debug from there. # David Smith On Thu, Apr 23, 2009 at 11:12 AM, Brendan Morse <morse.brendan at gmail.com> wrote:> > Hi all, I am running a simulation and a curious error keeps coming up > that stops the whole process. The error is a subscript out of bounds > error, and it seems to happen at different points (floating around) > throughout the looping simulation. Say, for example, it crashes on > sample 1 - iteration 200. I can force it to start again on iteration > 202 with all of the same settings, and it is fine. I can also force it > to start again on iteration 201 if I modify the starting seed value > and it goes on its merry way. What I think is happening is that > certain seed values are disrupting something and causing the subscript > error. > > My seeds are set as follows: The simulation has x number of > conditions. The starting seeds are set to equal the condition number > (1 to x). The program runs 500 iterations within each condition, and > the seed values for each iteration are set as x+iteration number. So, > for condition 1, iteration 1, the starting seed value would be 2, then > 3 etc. etc. At some point, I will get the subscript error but it seems > unpredictable. > > Has anyone had a similar problem or an idea as to what might be > happening? > > - Brendan > > > Brendan Morse, M.S. > Industrial/Organizational Psychology > Ohio University > Office: 335 Porter Hall > Website: http://oak.cats.ohiou.edu/~bm123504 > > > > > ? ? ? ?[[alternative HTML version deleted]] > > ______________________________________________ > 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. >-- David M Smith <david at revolution-computing.com> Director of Community, REvolution Computing www.revolution-computing.com Tel: +1 (206) 577-4778 x3203 (San Francisco, USA) Check out our upcoming events schedule at www.revolution-computing.com/events
> -----Original Message----- > From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On > Behalf Of Brendan Morse > Sent: Thursday, April 23, 2009 9:12 AM > To: r-help at r-project.org > Subject: [R] Floating simulation error > > > Hi all, I am running a simulation and a curious error keeps coming up > that stops the whole process. The error is a subscript out of bounds > error, and it seems to happen at different points (floating around) > throughout the looping simulation. Say, for example, it crashes on > sample 1 - iteration 200. I can force it to start again on iteration > 202 with all of the same settings, and it is fine. I can also force it > to start again on iteration 201 if I modify the starting seed value > and it goes on its merry way. What I think is happening is that > certain seed values are disrupting something and causing the subscript > error. > > My seeds are set as follows: The simulation has x number of > conditions. The starting seeds are set to equal the condition number > (1 to x). The program runs 500 iterations within each condition, and > the seed values for each iteration are set as x+iteration number. So, > for condition 1, iteration 1, the starting seed value would be 2, then > 3 etc. etc. At some point, I will get the subscript error but it seems > unpredictable. > > Has anyone had a similar problem or an idea as to what might be > happening? > > - Brendan > >Brendan, This is one of those situations where a self-contained, reproducible example would be really helpful. In the absence of that, seeing your actual code is absolutely necessary. I can't imagine anyone being able to provide any useful help here otherwise. 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