?'[' and the look for "partial matching"
On Fri, Mar 19, 2010 at 3:38 PM, Peter Keller <keller...@gmail.com> wrote: > > > data: > > tmp1 > Date HrMn Temp Q.4 > 1 19450101 0900 -37.0 1 > 2 19450101 1000 -35.9 2 > 3 19450101 1100 -35.9 3 > 4 19450101 1200 -36.4 4 > 5 19450101 1300 -36.4 5 > 6 19450101 1400 -36.4 6 > 7 19450101 1500 -36.4 7 > 8 19450101 1600 -37.5 9 > > Accidentally, I did this (I meant to write Q.4 instead of Q here) > > tmp1$Q[tmp1$Q!="1" & tmp1$Q!= "5"]<-NA > > I would have expected it to tank, but still got a new field with the the > values I wanted > > tmp1 > Date HrMn Temp Q.4 Q > 1 19450101 0900 -37.0 1 1 > 2 19450101 1000 -35.9 2 <NA> > 3 19450101 1100 -35.9 3 <NA> > 4 19450101 1200 -36.4 4 <NA> > 5 19450101 1300 -36.4 5 5 > 6 19450101 1400 -36.4 6 <NA> > 7 19450101 1500 -36.4 7 <NA> > 8 19450101 1600 -37.5 9 <NA> > > Can someone explain this? > Peter > > > sessionInfo() > R version 2.10.1 Patched (2010-03-16 r51294) > i386-pc-mingw32 > > locale: > [1] LC_COLLATE=English_United States.1252 LC_CTYPE=English_United > States.1252 > [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C > [5] LC_TIME=English_United States.1252 > > attached base packages: > [1] stats graphics grDevices utils datasets methods base > > other attached packages: > [1] lattice_0.18-3 fortunes_1.3-7 zoo_1.6-2 > > loaded via a namespace (and not attached): > [1] grid_2.10.1 tools_2.10.1 > > -- > View this message in context: > http://n4.nabble.com/strange-behavior-adds-new-field-by-non-existent-field-tp1603563p1603563.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<http://www.r-project.org/posting-guide.html> > and provide commented, minimal, self-contained, reproducible code. > -- Jim Holtman Cincinnati, OH +1 513 646 9390 What is the problem that you are trying to solve? [[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.
