On Tuesday 16 September 2003 14:39, [EMAIL PROTECTED] wrote: > Full_Name: Axel Benz > Version: 1.7.1 > OS: Windows > Submission from: (NULL) (137.251.33.43) > > > Hello, > I guess many people will answer me again that this is a S language feature, but > I am only a stupid computer scientist and I simply do not understand this logic, > despite of reading a lot about S: > > > test > field tuckey > 4 Kreis2 -1 > 5 Kreis5 -2 > 9 Metall -3 > 17 Kreis1 -4 > 19 Kreis8 -5 > > > subset(test,field=="Metall") > field tuckey > 9 Metall -3 > > > subset(test,toString(field)=="Metall") > [1] field tuckey > <0 rows> (or 0-length row.names)
I don't see any problem here. toString(field), evaluated in the data frame test, should be the single string "Kreis2, Kreis5, Metall, Kreis1, Kreis8" So, the comparison toString(field)=="Metall" actually does "Kreis2, Kreis5, Metall, Kreis1, Kreis8" == "Metall" which being false, returns FALSE, and so you finally should get subset(test, FALSE) which is what you do get. Perhaps you misunderstood what the function toString() does. HTH, Deepayan P.S. Please don't use R-bugs to report what may or may not be bugs, since all such reports have to be processed manually. Ask on r-help or r-devel first if you are not sure. ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-devel