Hi, Thanks for this solution! Very slick!
I see what you mean about the two calls to as_tibble(). I suppose I could do the following, but I doubt it is a gain... mm <- lapply(colnames(m), function(nm, m) type.convert(m[,nm], as.is = TRUE), m=m) names(mm) <- colnames(m) as_tibble(mm) # # A tibble: 4 × 5 # A B C D E # <chr> <chr> <chr> <int> <dbl> # 1 a e i 1 11.2 # 2 b f j 2 12.2 # 3 c g k 3 13.2 # 4 d h l 4 14.2 I'll benchmark these with writing to a temporary file and pasting together a string. Cheers and thanks, Ben On Apr 6, 2017, at 11:15 AM, Ulrik Stervbo <ulrik.ster...@gmail.com> wrote: > > Hi Ben, > > type.convert should do the trick: > > m %>% > as_tibble() %>% > lapply(type.convert) %>% > as_tibble() > > I am not too happy about to double 'as_tibble' but it get the job done. > > HTH > Ulrik > > On Thu, 6 Apr 2017 at 16:41 Ben Tupper <btup...@bigelow.org > <mailto:btup...@bigelow.org>> wrote: > Hello, > > I have a workflow yields a character matrix that I convert to a tibble. Here > is a simple example. > > library(tibble) > library(readr) > > m <- matrix(c(letters[1:12], 1:4, (11:14 + 0.2)), ncol = 5) > colnames(m) <- LETTERS[1:5] > > x <- as_tibble(m) > > # # A tibble: 4 × 5 > # A B C D E > # <chr> <chr> <chr> <chr> <chr> > # 1 a e i 1 11.2 > # 2 b f j 2 12.2 > # 3 c g k 3 13.2 > # 4 d h l 4 14.2 > > The workflow output columns can be a mix of a known set column outputs. Some > of the columns really should be converted to non-character types before I > proceed. Right now I explictly set the column classes with something like > this... > > mode(x[['D']]) <- 'integer' > mode(x[['E']]) <- 'numeric' > > # # A tibble: 4 × 5 > # A B C D E > # <chr> <chr> <chr> <int> <dbl> > # 1 a e i 1 11.2 > # 2 b f j 2 12.2 > # 3 c g k 3 13.2 > # 4 d h l 4 14.2 > > > I wonder if there is a way to use the read_* functions in the readr package > to read the character matrix into a tibble directly which would leverage > readr's excellent column class guessing. I can see in the vignette ( > https://cran.r-project.org/web/packages/readr/vignettes/readr.html > <https://cran.r-project.org/web/packages/readr/vignettes/readr.html> ) that > I'm not too far off in thinking this could be done (step 1 tantalizingly says > 'The flat file is parsed into a rectangular matrix of strings.') > > I know that I could either write the matrix to a file or paste it all into a > character vector and then use read_* functions, but I confess I am looking > for a straighter path by simply passing the matrix to a function like > readr::read_matrix() or the like. > > Thanks! > Ben > > Ben Tupper > Bigelow Laboratory for Ocean Sciences > 60 Bigelow Drive, P.O. Box 380 > East Boothbay, Maine 04544 > http://www.bigelow.org <http://www.bigelow.org/> > > ______________________________________________ > R-help@r-project.org <mailto:R-help@r-project.org> mailing list -- To > UNSUBSCRIBE and more, see > https://stat.ethz.ch/mailman/listinfo/r-help > <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. Ben Tupper Bigelow Laboratory for Ocean Sciences 60 Bigelow Drive, P.O. Box 380 East Boothbay, Maine 04544 http://www.bigelow.org [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list -- To UNSUBSCRIBE and more, see 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.
