Hello Petr, In fact spec is data.frame with a column called code (containing numerical values) and some other columns called data1, data2, ... containing data for each equipment (that is for each code).
But I don't have the data for all my devices. It means that some 'code' are not in spec$Code. In that case I want to assign a default value to the data. for example : spec$Code spec$data1 4 12.5 8 20.2 Then, with code=4 spec$data1[spec$Code==code]*(code %in%specmodules$Code) + 1*(!code %in% specmodules$Code) gives 12.5 But with code=654, I get numeric(0) instead of 1 because this value is not in spec$Code and returns numeric(0). I hope it is clearer (is it ?) and that you could find a nice way to write my test (the if-test works but is not very elegant). Thanks in adance for you help, Ptit Bleu. Petr Pikal wrote: > > Hi > > r-help-boun...@r-project.org napsal dne 04.03.2009 09:11:06: > >> >> Hello, >> >> I have a data.frame called spec containing data about samples. But I > don't >> have these data for all my samples. >> So if I have data (that is code of the sample is in spec$Code), I would > like >> to assign data1 to the variable m. >> If I don't have this data, I would like to assign 1 to m. >> >> I tried this : >> m<-spec$data1[spec$Code==code]*(code %in%specmodules$Code) + 1*(!code > %in% >> specmodules$Code) >> >> It works when I have the data but if it is not the case I get numeric(0) >> instead of 1. >> >> I finally use the following command. It works but I'm sure there is a > more >> elegant way. >> if (code %in%spec$Code) m<-spec$data1[spec$Code==code] else m<-1 > > It is a bit cryptic what do you want. Above version shall not work as it > takes only one logical value but you probably have vector of values. (We > do not know code, spec$Code or any other data you have). > > when I try your first construction with some values I have I get sensible > results so without trying to find out how your data really look like I > suggest you to inspect it more closely and/or provide some working example > demonstrating what you did, what is the result and how the result shall > look like. > > zdrz$sklon*zdrz$otac %in% c(.6,1.2,2)+1*!(zdrz$otac %in% c(.6,1.2,2)) > [1] 110 80 50 50 10 1 120 80 50 20 > zdrz$otac[5]<-NA > zdrz$sklon*zdrz$otac %in% c(.6,1.2,2)+1*!(zdrz$otac %in% c(.6,1.2,2)) > [1] 110 80 50 50 1 1 120 80 50 20 > zdrz$sklon[4]<-Inf > zdrz$sklon*zdrz$otac %in% c(.6,1.2,2)+1*!(zdrz$otac %in% c(.6,1.2,2)) > [1] 110 80 50 Inf 1 1 120 80 50 20 > zdrz$sklon[4]<-NA > zdrz$sklon*zdrz$otac %in% c(.6,1.2,2)+1*!(zdrz$otac %in% c(.6,1.2,2)) > [1] 110 80 50 NA 1 1 120 80 50 20 > > Regards > Petr > >> >> Is there a way to avoid an if-test ? >> >> Thanks for your help, >> Have a good day, >> Ptit Bleu. >> >> -- >> View this message in context: > http://www.nabble.com/nice-way-to-find-or-not-a- >> value-%28problem-with-numeric%280%29%29-tp22325406p22325406.html >> Sent from the R help mailing list archive at Nabble.com. >> >> ______________________________________________ >> 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. > > -- View this message in context: http://www.nabble.com/nice-way-to-find-or-not-a-value-%28problem-with-numeric%280%29%29-tp22325406p22352529.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.