[R] how to specify point symbols in the key on a lattice dotplot

[Bert Gunter]

Oh, and for correct syntax with R's |> operator, "data = ." , should
be "data = _" ; although the former seemed to work.

-- Bert

On Fri, Sep 13, 2024 at 10:45 AM Bert Gunter <bgunter.4567 using gmail.com> wrote:
>
> "Why does key = list(points = 16:17)  not work? "
>
> Because, from the "key" section of ?xyplot
> " The contents of the key are determined by (possibly repeated)
> components named "rectangles", "lines", "points" or "text". Each of
> these must be **lists** with relevant graphical parameters (see later)
> controlling their appearance."
>
> Ergo, try:
>
> dd |> dotplot( segment ~ transit_time, groups = impact,  data = .,
>                 pch = 16:17,
>                 cex = 1.8,
>                 scales = list(cex = 1.4),
>                 key = list(points = list(pch =16:17) ))
>
> Cheers,
> Bert
>
>
> On Fri, Sep 13, 2024 at 9:53 AM Christopher W. Ryan
> <cwr using agencystatistical.com> wrote:
> >
> >
> > dd %>% dotplot( segment ~ transit_time, groups = impact,  data = .,
> >                pch = 16:17,
> >                cex = 1.8,
> >                scales = list(cex = 1.4),
> >                key = list(points = 16:17) )
> >
> > produces a graph with no discernible key, but with an asterisk at the
> > top, above the plotting region.
> >
> > Same result from
> >
> > dd %>% dotplot( segment ~ transit_time, groups = impact,  data = .,
> >                pch = 16:17,
> >                cex = 1.8,
> >                scales = list(cex = 1.4),
> >                key = list(points = 16:17),
> >                auto.key = TRUE )
> >
> >
> >
> >
> > dd %>% dotplot( segment ~ transit_time, groups = impact,  data = .,
> >                scales = list(cex = 1.4),
> >                par.settings = simpleTheme(pch = 16:17, cex = 1.8),
> >                auto.key = TRUE)
> >
> > produces the desired result.
> >
> > Why does key = list(points = 16:17)  not work?  Below is a MWE:
> >
> > ================================
> >
> > library(lattice)
> > library(dplyr)
> > dd <- structure(list(impact = structure(c(1L, 1L, 1L, 1L, 2L, 2L, 2L,
> > 2L), levels = c("impaction", "no impaction"), class = "factor"),
> >     segment = structure(c(4L, 2L, 1L, 3L, 4L, 2L, 1L, 3L), levels =
> > c("left", "right", "rectosigmoid", "total"), class = c("ordered",
> > "factor" )), transit_time = c(70, 10, 20, 32, 42, 10, 12, 18)), class =
> > "data.frame", row.names = c(NA, -8L))
> >
> > dd %>% dotplot( segment ~ transit_time, groups = impact,  data = .,
> >                pch = 16:17,
> >                cex = 1.8,
> >                scales = list(cex = 1.4),
> >                key = list(points = 16:17) )
> >
> > =================================
> >
> >
> > Thanks.
> >
> > --Chris Ryan
> > --
> > Agency Statistical Consulting, LLC
> > Helping those in public service get the most from their data.
> > www.agencystatistical.com
> >
> > Public GnuPG email encryption key at
> > https://keys.openpgp.org
> > 9E53101D261BEC070CFF1A0DC8BC50E715A672A0
> >
> >
> > On Fri, 13 Sep 2024 08:29:20 +0100, CALUM POLWART wrote:
> >
> > >Add:
> > >
> > >key = list(points=16:17)
> > >
> > >Into the dotplot section possibly without the autokey
> > >
> > >On Fri, 13 Sep 2024, 08:19 Christopher W. Ryan,
> > ><cwr using agencystatistical.com> wrote:
> > >
> > >> I am making a dotplot with lattice, as follows:
> > >>
> > >> dd %>% dotplot( segment ~ transit_time, groups = impact,  data = .,
> > >>                as.table = TRUE,
> > >>                 pch = 16:17,
> > >>                 cex = 1.8,
> > >>                 scales = list(cex = 1.4),
> > >>                auto.key = TRUE)
> > >>
> > >> impact is a factor with two levels.
> > >>
> > >> They key shows 2 open circles, one of each color of my two
> > >> plotting symbols, one for each group. I would like the
> > >> symbols in the key to match the plotting characters in the graph: 16
> > >> (filled circle) for one group and 17 (filled triangle) for the second
> > >> group.  How would I do that? I have not had any success with
> > >> supplying arguments to auto.key, simpleKey, or key. Guess I'm not
> > >> understanding the syntax.
> > >>
> > >> Thanks.
> > >>
> > >> --Chris Ryan
> > >>
> > >> --
> > >> Agency Statistical Consulting, LLC
> > >> Helping those in public service get the most from their data.
> > >> www.agencystatistical.com
> > >>
> > >> Public GnuPG email encryption key at
> > >> https://keys.openpgp.org
> > >> 9E53101D261BEC070CFF1A0DC8BC50E715A672A0
> > >>
> > >> ______________________________________________
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> > >> https://stat.ethz.ch/mailman/listinfo/r-help
> > >> PLEASE do read the posting guide
> > >> https://www.R-project.org/posting-guide.html
> > >> and provide commented, minimal, self-contained, reproducible code.
> > >>
> >
> > ______________________________________________
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