Thanks to Mollie and a few others who wrote in recommending the try() and tryCatch() functions. They work great!
I recognize my question was a basic one, but there are so many useful R functions, and the listserv is a great place to find new and useful ones I'd never encountered before. Thanks again, Phil On 7/25/2013 10:07 AM, Mollie Brooks wrote: Hi Phil, Check out the try() function. cheers, Mollie ------------------------ Mollie Brooks, PhD Postdoctoral Researcher, Population Ecology Research Group http://www.popecol.org Institute of Evolutionary Biology & Environmental Studies, University of Zürich On 25 Jul 2013, at 3:32 PM, "Novack-Gottshall, Philip M." <pnovack-gottsh...@ben.edu<mailto:pnovack-gottsh...@ben.edu>> wrote: Hi all, I'm wondering if anyone knows of a function to continue after a stop/error call in a loop. Something akin to next, but able to deal with a stop-error. I'm analyzing many samples, and some statistics/models can not be applied to certain ones. The reasons why vary across samples, so it's not as straightforward as adding a rule like "if sample size is < x, go to next sample." It would be easier if there was a rule like "if the following function results in an error, go to next sample." However, all "stops" I know of permanently end the execution, and so adding a "next" doesn't seem to work. Here's a contrived example showing what I mean, which executes the first two cases, but the third "stops", preventing execution for the fourth case: library(MASS) set.seed(314) size <- c(10, 20, 1, 5) for (i in 1:4) { print(fitdistr(rnorm(size[i], mean=20), "gamma")) } # One solution would be to add a line like: if(size[i] < 1) next # But in my case, there would have to be many different such "next" rules, and some I can't figure out exactly why an error is being produced # Can anyone point me in a useful direction? I'm looking for something like: if(error) next Thanks, Phil -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Phil Novack-Gottshall Assistant Professor Department of Biological Sciences Benedictine University 5700 College Road Lisle, IL 60532 pnovack-gottsh...@ben.edu<mailto:pnovack-gottsh...@ben.edu> Phone: 630-829-6514 Fax: 630-829-6547 Office: 332 Birck Hall Lab: 107 Birck Hall http://www1.ben.edu/faculty/pnovack-gottshall ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ _______________________________________________ R-sig-ecology mailing list R-sig-ecology@r-project.org<mailto:R-sig-ecology@r-project.org> https://stat.ethz.ch/mailman/listinfo/r-sig-ecology -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Phil Novack-Gottshall Assistant Professor Department of Biological Sciences Benedictine University 5700 College Road Lisle, IL 60532 pnovack-gottsh...@ben.edu<mailto:pnovack-gottsh...@ben.edu> Phone: 630-829-6514 Fax: 630-829-6547 Office: 332 Birck Hall Lab: 107 Birck Hall http://www1.ben.edu/faculty/pnovack-gottshall ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ [[alternative HTML version deleted]]
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