Hi Jeff, The code you show is exactly what I usually do, in base R; but I wanted to play with tidyverse to learn it (and also understand when it makes sense and when it doesn't).
And yes, of course, in the example I gave, I end up with a 1-cell tibble, which could be better extracted as a length-1 vector. But my real goal is not to end up with a single value or even a single column. I just thought that simplifying my example was the best approach to ask for advice. But thank you for letting me know that what I'm doing is pointless! Ivan -- Dr. Ivan Calandra TraCEr, laboratory for Traceology and Controlled Experiments MONREPOS Archaeological Research Centre and Museum for Human Behavioural Evolution Schloss Monrepos 56567 Neuwied, Germany +49 (0) 2631 9772-243 https://www.researchgate.net/profile/Ivan_Calandra On 19/08/2020 19:27, Jeff Newmiller wrote: > The whole point of dplyr primitives is to support data frames... that is, > lists of columns. When you pare your data frame down to one column you are > almost certainly using the wrong tool for the job. > > So, sure, your code works... and it even does what you wanted in the dplyr > style, but what a pointless exercise. > > grep( "a", mytbl$file, value=TRUE ) > > On August 19, 2020 7:56:32 AM PDT, Ivan Calandra <calan...@rgzm.de> wrote: >> Dear useRs, >> >> I'm new to the tidyverse world and I need some help on basic things. >> >> I have the following tibble: >> mytbl <- structure(list(files = c("a", "b", "c", "d", "e", "f"), prop = >> 1:6), row.names = c(NA, -6L), class = c("tbl_df", "tbl", "data.frame")) >> >> I want to subset the rows with "a" in the column "files", and keep only >> that column. >> >> So I did: >> myfile <- mytbl %>% >> filter(grepl("a", files)) %>% >> select(files) >> >> It works, but I believe there must be an easier way to combine filter() >> and select(), right? >> >> Thank you! >> Ivan ______________________________________________ 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.
