Some systems (both hardware and software) may have "watchdog" timers; I was just using it to illustrate a point as to one way of breaking out. In the case of this loop, it probably run too fast to try and put a timer on it; counting the iterations is good enough. There are some ways of creating timers in R, but I have not used them.
On Tue, Mar 22, 2011 at 1:32 PM, Hosack, Michael <mhos...@state.pa.us> wrote: > Thank you Jim, I was not aware of watchdog timers. R is my first computer > language. I searched through the archives and found the function setTimeLimit > and applied it with low values for cpu and elapsed time. It provides a way > out of the loop which is what I needed. It's not a counter, but I could not > find any info. on them in the R archives. > > Thanks again > > Mike > > > -----Original Message----- > From: jim holtman [mailto:jholt...@gmail.com] > Sent: Tuesday, March 22, 2011 1:00 PM > To: Hosack, Michael > Cc: r-help@R-project.org > Subject: Re: [R] Infinite loop > > The simple thing to do is to put a sanity counter in the 'repeat' > statement and if you have been through it a certain number of times, > then exit. Anytime you have a loop that might run forever, you should > have some sanity/watchdog timer on it. > > On Tue, Mar 22, 2011 at 11:02 AM, Hosack, Michael <mhos...@state.pa.us> wrote: >> R experts, >> >> Hello, I am trying to sample a vector 1:40 without replacement such that no >> element in the new vector >> is within 7 units of either of its immediate neighbors. This is part of a >> larger program I am working >> on. The following code works well about 65 % of the time (14/40). The >> problem I encounter happens when >> the last element remaining to be sampled from the vector STRATA is within 7 >> digits +- of the last element >> in the vector s1, at which point an infinite loop occurs. At least that's >> what I think is happening. >> Any help would be greatly appreciated. >> >> Thank you, >> >> Mike >> >> require(IRanges) >> STRATA <- 1:40 >> s1 <- sample(STRATA, 1) >> for (i in seq(from = 1, to = 39, by = 1)){ >> repeat{ >> tmp <- sample(STRATA, 1) >> if (!any(s1 == tmp) & !any(as.vector(IRanges(s1[length(s1)]-7, >> s1[length(s1)]+7)) %in% tmp)) break >> } >> s1 <- c(s1,tmp) >> } >> s1 >> >> ______________________________________________ >> 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 > Data Munger Guru > > What is the problem that you are trying to solve? > -- Jim Holtman Data Munger Guru 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.
