[R] Removing NAs from dataframe (for use in Vioplot)

[Martin Maechler]

>>>>> Bert Gunter <bgunter.4567 at gmail.com>
>>>>>     on Mon, 2 May 2016 06:20:52 -0700 writes:

    > Martin et. al.:
    > na.omit(frame) will remove all rows/cases in which an NA occurs.  I'm
    > not sure that this is what the OP wanted, which seemed to be to
    > separately remove NA's from each column and plot the resulting column.
    > This is what the lapply (and the OP's provided code) does, anyway.

    > Also, lapply() produces a single list (of vectors), not a "series of lists" .

    > Corrections happily accepted if I'm in error.

No corrections needed.  You were right ... and indeed I was
wrong in assuming that "one would want"  a complete  na.omit()
here.

Martin



    > Cheers,
    > Bert

    > Bert Gunter

    > "The trouble with having an open mind is that people keep coming along
    > and sticking things into it."
    > -- Opus (aka Berkeley Breathed in his "Bloom County" comic strip )


    > On Mon, May 2, 2016 at 1:49 AM, Martin Maechler
    > <maechler at stat.math.ethz.ch> wrote:
    >>>>>>> Mike Smith <mike at hsm.org.uk>
    >>>>>>> on Sun, 1 May 2016 08:15:44 +0100 writes:
    >> 
    >> >>>> On Apr 30, 2016, at 12:58 PM, Mike Smith
    >> >>>> <mike at hsm.org.uk> wrote: Hi
    >> 
    >> >>>> First post and a relative R newbie....
    >> 
    >> >>>> I am using the vioplot library to produce some violin
    >> >>>> plots.
    >> 
    DW> It's a package, .... not a library.
    >> 
    >> [yes!]
    >> 
    >> 
    >> >>>> 1. Is there a more elegant way of automatically
    >> >>>> stripping the NAs, passing the columns to the function
    >> >>>> along with the header names??
    >> 
    >> >>> ds2 <- lapply( ds1, na.omit)
    >> 
    >> 
    >> > Fantastic - that does the trick! Easy when you know how!!
    >> 
    >> > Follow-on: is there a way feed all the lists from ds2 to
    >> > vioplot? It is now a series of lists (rather than a
    >> > dataframe - is that right?).
    >> 
    >> Yes, that's right.  So after all the above was not really
    >> perfect :
    >> 
    >> na.omit() has been designed as a generic function and has always
    >> had a method for "data.frame"; so, really
    >> 
    >> ds.noNA <- na.omit(ds1)
    >> or  ds0NA   <- na.omit(ds1)
    >> 
    >> (choosing "expressive names")
    >> 
    >> is what you want.
    >> 
    >> ______________________________________________
    >> R-help at 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.