Hi Not much helpful. Now we know what you ***think*** alpha is but not what it really is.
You shall post at least result of str(your.objects) I also wonder why do you populate slots in perf manually and with data.frames instead of lists which are required according to documentation. Regards Petr > -----Original Message----- > From: r-help-boun...@r-project.org [mailto:r-help-bounces@r- > project.org] On Behalf Of Marta valdes lopez > Sent: Thursday, July 03, 2014 12:35 PM > To: r-help@r-project.org > Subject: Re: [R] error:max not meaningful for factors > > Thank you Jim for your answer.Ok alpha( it is the speed of the boat) is > a range of number from 0.5 to 10 like 0.5,1,1.5,2...., I would like to > have the mean of x and y base on each value of alpha, because I have > like ten numbers of x for each value of speed, thats why I want the > mean of that and them i could create the roc plot with the new values. > I would say that alpha values are ordered already? > > Thanks , Marta > > > > 2014-07-03 1:17 GMT+02:00 Jim Lemon <j...@bitwrit.com.au>: > > > On Wed, 2 Jul 2014 02:42:31 PM Marta valdes lopez wrote: > > > Hello, > > > > > > I run this script , because i would like to do the mean of x and y > > > base > > on > > > alpha as factor. > > > > > > > > > library(xlsx) > > > library(ROCR > > > filename<-"amanhecer roc.csv" > > > rocdata<- read.table(filename, sep=";",header=TRUE,dec=",") > > > > > > rocdata$alpha.15_12 <- as.factor(rocdata$alpha.15_12) > > > > > > TPaverage <- tapply(rocdata$y.15_12, rocdata$alpha.15_12, mean) > > > FPaverage <- tapply(rocdata$x.15_12, rocdata$alpha.15_12, mean) > > > > > > ###And them with the new data i want to create a plot, kind of ROC > > plot. > > > > > > Anthias<-rocdata > > > str(Anthias) > > > data(ROCR.simple) > > > pred <- prediction( ROCR.simple$predictions, ROCR.simple$labels ) > > > perf <- performance( pred, "tpr", "fpr" ) windows(width = 9.5, > > > height = 10.50) par(mfrow = c(1,1)) > > > > > > cc<-Anthias[1] > > > ee<-Anthias[2] > > > aa<-Anthias[3] > > > p...@x.name<-"FP" > > > p...@y.name<-"TP" > > > p...@alpha.name<-"Speed" > > > bb<-data.frame(aa) > > > perf@x.values<-bb > > > dd<-data.frame(cc) > > > perf@y.values<-dd > > > ff<-data.frame(ee) > > > perf@alpha.values<-ff > > > > > > plot(perf, main="Teste", colorize=TRUE, > > coloraxis.at=c(0,2,4,6,8,10), > > > coloraxis.cex.axis=0.8, colorize.palette=(rainbow(256,start=0, > > end=0.7)), > > > lwd=7, colorkey.relwidth=0.4, yaxis.las=1) > > > > > > But after run the whole script i got the error:max not meaningful > > > for factors, anyone can help me? I am a beginner in R ,so sorry if > > > this is wasting anyone's time*.* > > > > > Hi Marta, > > The error message is straightforward. Somewhere in one of the > > functions you have called, the "max" function is applied to your > > factor variable. The definition of factor variables is that the the > > actual values are of nominal class, in which there is no meaningful > > ordering of values, therefore the maximum value is undefined. You > > could try as.numeric(alpha), but that is dangerous as it depends on > > whether the sorting of values (default alphabetic) is what you want. > > If we knew what "alpha" was, it would help. > > > > Jim > > > > > > [[alternative HTML version deleted]] > > ______________________________________________ > 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. ________________________________ Tento e-mail a jakékoliv k němu připojené dokumenty jsou důvěrné a jsou určeny pouze jeho adresátům. Jestliže jste obdržel(a) tento e-mail omylem, informujte laskavě neprodleně jeho odesílatele. Obsah tohoto emailu i s přílohami a jeho kopie vymažte ze svého systému. Nejste-li zamýšleným adresátem tohoto emailu, nejste oprávněni tento email jakkoliv užívat, rozšiřovat, kopírovat či zveřejňovat. 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