Perhaps you meant to point this out, but the cfs[which.max(cfs)] and cfs == ... are not the same:
> x <- rep(1:2,3) > x [1] 1 2 1 2 1 2 > x[which.max(x)] [1] 2 > x[x==max(x)] [1] 2 2 2 So maybe your point is: which does the OP want (in case there are repeated maxes)? I suspect the == forms, but ...? Bert Gunter On Fri, Dec 3, 2021 at 2:56 PM Rui Barradas <ruipbarra...@sapo.pt> wrote: > > Hello, > > Inline. > > Às 22:08 de 03/12/21, Rich Shepard escreveu: > > On Fri, 3 Dec 2021, Rich Shepard wrote: > > > >> I find solutions when the data_frame is grouped, but none when it's not. > > > > Thanks, Bert. ?which.max confirmed that's all I need to find the maximum > > value. > > > > Now I need to read more than ?filter to learn why I'm not getting the > > relevant row with: > >> which.max(pdx_disc$cfs) > > [1] 8054 > > This is the *index* for which cfs is the first maximum, not the maximum > value itself. > > > > >> filter(pdx_disc, cfs == 8054) > > Therefore, you probably want any of > > > filter(pdx_disc, cfs == cfs[8054]) > > filter(pdx_disc, cfs == cfs[which.max(cfs)]) > > filter(pdx_disc, cfs == max(cfs)) # I find this one better, simpler > > > Hope this helps, > > Rui Barradas > > > > # A tibble: 0 × 9 > > # … with 9 variables: site_nbr <chr>, year <int>, mon <int>, day <int>, > > # hr <dbl>, min <dbl>, tz <chr>, cfs <dbl>, sampdt <dttm> > > > > Regards, > > > > Rich > > > > ______________________________________________ > > 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. > > ______________________________________________ > 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. ______________________________________________ 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.