Hello all, I'm a beginner in R working on a script that will produce a set of models (linear, polynomial and logistic) for each location in a dataset. However, the self-starting logistic model often fails - if this happens I would like to just skip to the next iteration of the loop using tryCatch.
I've looked at a few examples and read the help file, but didn't understand tryCatch in the context of my script. Any help or suggestions (even telling me where to insert the tryCatch command) would be much appreciated!! Below is the script I am currently working on: data<-read.csv(file.choose(),sep=",",header=T) #File name is cbc.subset data$location.code = as.character(data$location.code) locs = unique(location.code) pdf("mygraphs.pdf",height=8, width=10) par(mfrow=c(3,4)) for(s in 1:length(locs)){ #To plot data from a particular stateroute: sub.ECDO<-data[data$location.code == locs[s],] plot(abund~year, data=sub.ECDO, main=locs[s]) #To plot the linear model for the specified location: lmodel<-lm(abund~year, data=sub.ECDO) abline(lmodel$coefficients[1],lmodel$coefficients[2],lty=2) #To plot the polynomial model for the specified location: polymodel<-lm(abund~year+I(year^2), data=sub.ECDO) xv<-seq(min(sub.ECDO$year),max(sub.ECDO$year),0.1) yv<-predict(polymodel,list(year=xv)) lines(xv,yv) #To plot the logistic model #####tryCatch logis<-nls(abund~SSlogis(year,a,b,c),data=sub.ECDO) yv<-predict(logis,list(year=xv)) lines(xv,yv) #To find which model is the best fit: if ("logis" %in% ls()) { AIC.results = AIC(lmodel,polymodel,logis) } else { AIC.results = AIC(lmodel,polymodel) } #Add text to plot text(min(sub.ECDO$year)+2,0.9*max(sub.ECDO$abund),paste("linear = ",AIC.results[1,2],"\npolynomial = ",AIC.results[2,2],"\nlogistic = ",AIC.results[3,2],sep="")) rm(logis) rm(polymodel) rm(lmodel) } dev.off() Thank you! -- View this message in context: http://r.789695.n4.nabble.com/Help-with-tryCatch-with-a-for-loop-tp4020475p4020475.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.