There are quite a few examples in (1) ?strapply, (2) on the home page and (3) in the vignette (4) on r-help back posts
if you having problems with understanding the textual description. Note that X and FUN are also arguments to sapply > args(sapply) function (X, FUN, ..., simplify = TRUE, USE.NAMES = TRUE) NULL so the sapply construct in your post has the effect of applying c to tmp, pats and strapply so the output you observe is correct. The sapply command never even calls strapply. On Sun, May 2, 2010 at 8:20 PM, OKB (not okblacke) <brenb...@brenbarn.net> wrote: > Gabor Grothendieck wrote: > >> The strapply function in gsubfn does that. See >> http://gsubfn.googlecode.com > > Ah, thanks. The documentation for that function is pretty > difficult to grasp, but I think I figured it out. . . almost. However, > for some reason I can't seem to make strapply work inside an sapply (to > do multiple regex searches over the same data). For instance, take a > look at this toy setup. > >> pats > [1] "([^ ]+) .i. ([^ ]+)" "([^ ]+) ..g ([^ ]+)" >> tmp > [1] "this is a big test" "this is a pig test" "this is a lim test" > "this is a non test" "this is a big foolio" > [6] "this is a wig foolio" "this is a fog test" "this is a bog test" > > With these data, strapply(tmp, pats[1], c) works as expected, as > does strapply(tmp, pats[2], c). However, this doesn't work: > > sapply(pats, strapply, X=tmp, FUN=c) > > Instead it returns a strange table, some of whose elements contain the > code of strapply itself. Also, the above code gives different results > depending on whether I specify "X=tmp" or simply "tmp" as the third > argument. Shouldn't these be the same, since X is the first argument of > strapply? Any idea what's going on here? > > Thanks again, > -- > --OKB (not okblacke) > Brendan Barnwell > "Do not follow where the path may lead. Go, instead, where there is > no path, and leave a trail." > --author unknown > > ______________________________________________ > 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.
