Hi Try
line[,line<=-0.7,drop=F] drop=F,keep the dimensions. On Mon, Apr 19, 2010 at 5:15 PM, Duncan Elkins <[email protected]>wrote: > Hi, list- > I've got a large list of multi-column data and I'd like to filter > it according to a threshold, such as, "show me the values that are > above 0.4 for each line." > > For instance, if the line of data were: > > line > v1 v2 v3 v4 v5 v6 v7 v8 v9 > 1 -0.32 0.66 -0.35 -0.82 0.38 0.66 -0.02 -0.11 -0.64 > > I can do this > > line[,line >= 0.4] > v2 v6 > 1 0.66 0.66 > > and > > > names(line[,line >= 0.4]) > [1] "v2" "v6" > > That's great. But, if there's only one value which passes the test, as in: > > > line[,line <= -0.7] > [1] -0.82 > > The single value loses its name attribute (in this case, I want "v4"). > I guess I could kludge this by adding a dummy column that always > passes and trimming it out of the output, later, but it seems like > there ought to be an easier way. Am I misusing the bracket notation, > or ignorant of some obvious way to subset just one column and retain > its name? > > Thanks, > Duncan > > ______________________________________________ > [email protected] 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. > -- Tengfei Yin MCDB PhD student 1620 Howe Hall, 2274, Iowa State University Ames, IA,50011-2274 Homepage: www.tengfei.name English Blog: www.tengfei.name/en Chinese Blog: www.tengfei.name/ch [[alternative HTML version deleted]] ______________________________________________ [email protected] 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.
