Waverley, you can also use p...@y.values to access the slot (see help(performance-class) for a description of the slots).
You might also want have a look at the code for demo(ROCR) and at this slide deck: http://rocr.bioinf.mpi-sb.mpg.de/ROCR_Talk_Tobias_Sing.ppt HTH, Tobias On Sat, Feb 7, 2009 at 10:40 PM, Jorge Ivan Velez <jorgeivanve...@gmail.com> wrote: > Hi Waverley, > I forgot to tell you that "perf" is your performance object. Here is an > example from the ROCR package: > ## computing a simple ROC curve (x-axis: fpr, y-axis: tpr) > library(ROCR) > data(ROCR.simple) > pred <- prediction( ROCR.simple$predictions, ROCR.simple$labels) > perf <- performance(pred,"tpr","fpr") > > # y.values > unlist(slot(perf,"y.values")) > > HTH, > > Jorge > > > >> On Sat, Feb 7, 2009 at 3:17 PM, Waverley <waverley.paloa...@gmail.com>wrote: >> >>> Hi, >>> >>> I have a question about ROCR package. I got the ROC curve plotted >>> without any problem following the manual. However, I don't know to >>> extract the values, e.g. y.values ( I think it is the area under the >>> curve auc measure). The return is an object of class "performance" >>> which have Slots and one of the slot is "y.values". I type the object >>> and I can see them in screen. But I want to extract the value for >>> further programming and computation. I did a summary of the object >>> and it is a "S4" mode which I don't understand. >>> >>> Can someone help? >>> >>> Thanks a lot in advance. >>> >>> -- >>> Waverley @ Palo Alto >>> >>> ______________________________________________ >>> 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. >>> >> >> > > [[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. > ______________________________________________ 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.
