On 02/22/2010 08:46 AM, Jay wrote: > Tahnk you. But, when I try the command you both suggested I get a NULL > as the results. > >> names(object1 @ x.values) > NULL > > Where did I go wrong? > > > On Feb 22, 4:34 pm, David Winsemius <dwinsem...@comcast.net> wrote: >> On Feb 22, 2010, at 8:05 AM, Jay wrote: >> >> >> >>> The function prediction() returns this: >> >>> Formal class 'performance' [package "ROCR"] with 6 slots >>> ..@ x.name : chr "Cutoff" >>> ..@ y.name : chr "Accuracy" >>> ..@ alpha.name : chr "none" >>> ..@ x.values :List of 1 >>> .. ..$ : Named num [1:89933] Inf 2.23 2.22 2.17 2.16 ... >>> .. .. ..- attr(*, "names")= chr [1:89933] "" "36477" "56800"
pred...@x.values is a list. The first element of the list pred...@x.values[[1]] is a numeric vector. The numeric vector has names. So names(pred...@x.values[[1]]). Martin >>> "41667" ... >>> ..@ y.values :List of 1 >>> .. ..$ : num [1:89933] 0.5 0.5 0.5 0.5 0.5 ... >>> ..@ alpha.values: list() >> >>> Now, since I want to match each prediction with its original case, I >>> need to extract the names, i.e. the information in "- attr(*, >>> "names")= chr [1:89933] "" "36477" "56800" "41667" ..." so I can use >>> it with a simple datafile[names,] query. >> >>> How do I get these names in plain number formats? >> >> Not sure what you mean by "plain number formats" but this should get >> you a vector of "names" assuming the prediction object is named >> "predobject": >> >> names( predobj...@x.values ) >> >> If you wanted them "as.numeric", then that is the name of the >> appropriate function. >> >> -- >> David >> >> >> >>> ______________________________________________ >>> r-h...@r-project.org mailing list >>> https://stat.ethz.ch/mailman/listinfo/r-help >>> PLEASE do read the posting guidehttp://www.R-project.org/posting-guide.html >>> and provide commented, minimal, self-contained, reproducible code. >> >> ______________________________________________ >> r-h...@r-project.org mailing listhttps://stat.ethz.ch/mailman/listinfo/r-help >> PLEASE do read the posting guidehttp://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. -- Martin Morgan Computational Biology / Fred Hutchinson Cancer Research Center 1100 Fairview Ave. N. PO Box 19024 Seattle, WA 98109 Location: Arnold Building M1 B861 Phone: (206) 667-2793 ______________________________________________ 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.
