I know that if you have to resort to 'parse(text=...)', you should look for another way (it is a 'fortune'), but it is getting late, and at least it works:
> eval(parse(text="subset(df, A==1 & B==1)")) A B 1 1 1 On Sat, Mar 20, 2010 at 9:09 PM, Mark Heckmann <mark.heckm...@gmx.de> wrote: > df <- data.frame(A=c(1,2), B=c(1,1)) > > I have a string containing a condition for a subset function, like: > conditionAsString <- paste(names(df), df[1,], sep="==", collapse=" & ") > > conditionAsString > > "A==1 & B==1" > > Now I want to use this string in the subset call, like > > subset(df, conditionAsString) > > I do not exactly now how to combine substitute, expression, parse and > so on to get what I want, which would be: > > subset(df, A==1 & B==1) > > but using the string conditionAsString. > > Thanks, > Mark > > Mark Heckmann > Blog: www.markheckmann.de > R-Blog: http://ryouready.wordpress.com > > > > > > [[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<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.
