Try this: subset(x, eval(parse(text=filter)))
On Wed, Jul 8, 2009 at 4:46 PM, Tracey Frescino <tfresc...@fs.fed.us> wrote: > Hi, > > I am trying to subset a dataset based on a filter defined by a user... > I prompt the user for input.. resulting in a string logical expression > ("X1 < 3"). > > I have tried using subset, but it is looking for a logical expression, not > a character string. > I keep getting the error: 'subset' must evaluate to logical. > > > Example: > x <- data.frame(matrix(1:15, nrow=5, ncol=3)) > filter = "X1 < 3" > subset(x, filter) > > > Any ideas?? > > > > Thanks much, > Tracey > > [[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. > -- Henrique Dallazuanna Curitiba-Paraná-Brasil 25° 25' 40" S 49° 16' 22" O [[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.