Hello, to plot the result of a singular non linear regression (using nls) I usually use the function plotfit, for example:
r.PTG.V<-nls(PTG.P~ fz1(Portata, a,b), data=dati, start=list(a=10, b=10), nls.control(maxiter=200), algorithm='port', trace=TRUE, na.action=na.omit, lower=list(a=0, b=10), upper=list(a=100, b=100)) plotfit(r.PTG.V) I tried to use the function plotfit on the result of the following for loop but I got an error message: for (i in 1:length(formList)) { resultList[[i]] <- nls(formList[[i]], data=subset(dati, Fiume=="Laveggio"), start=startList7[[i]], nls.control(maxiter=1000, warnOnly=TRUE), algorithm='port', na.action=na.omit,lower=lowerList7[[i]], upper=upperList7[[i]]) } plotfit(resultList[[1]] "Error in diff(as.numeric(y[ord])) : (list) object cannot be coerced to type 'double'" Could somebody tell me what this error means? how can I fix this problem? Any suggestion appreciated!! Thanks, Laura ______________________________________________ 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.