[R] Plotting rgb proportions in R

PIKAL Petr petr@pik@l @ending from prechez@@cz
Wed Dec 19 11:28:15 CET 2018


Hi

> -----Original Message-----
> From: R-help <r-help-bounces using r-project.org> On Behalf Of Bert Gunter
> Sent: Wednesday, December 19, 2018 5:26 AM
> To: Jim Lemon <drjimlemon using gmail.com>
> Cc: R-help <r-help using r-project.org>
> Subject: Re: [R] Plotting rgb proportions in R
>
> 3-d Proportions must sum to 1and are thus actually 2-d and should preferaby
> be plotted as a ternary plot. Several r packages will do this for you, e.g.
> package Ternary. Search "ternary plots" on rseek.org for others.

From which I would recommend ggtern. Sometimes a bit tricky but quite handy, especially when you consider some grouping.

Cheers
Petr

>
> -- 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 Tue, Dec 18, 2018 at 3:10 PM Jim Lemon <drjimlemon using gmail.com> wrote:
>
> > Hi Tasha,
> > I may be right off the track, but you could plot RGB proportions on a
> > 3D plot. The easiest way I can think if would be to convert your 0-255
> > values to proportions:
> >
> > rgb_prop<-read.table(text="Red Green Blue pct
> > 249 158 37 56.311
> > 249 158 68 4.319
> > 249 158 98 0.058
> > 249 128 7 13.965
> > 249 128 37 12.87
> > 188 128 37 0.029
> > 249 128 68 0.161
> > 188 128 68 0.015
> > 188 98 7 0.029
> > 219 128 7 2.773
> > 219 128 37 2.583
> > 188 98 68 0.058
> > 219 128 68 0.525
> > 249 188 37 0.876
> > 249 188 68 1.08
> > 219 98 7 0.482
> > 249 188 98 0.015
> > 249 158 7 3.852",header=TRUE)
> > rgb_prop$Red<-rgb_prop$Red/255
> > rgb_prop$Green<-rgb_prop$Green/255
> > rgb_prop$Blue<-rgb_prop$Blue/255
> > library(scatterplot3d)
> > scatterplot3d(rgb_prop[,1:3],cex.symbols=sqrt(rgb_prop[,4]),
> >  color=rgb(rgb_prop[,1],rgb_prop[,2],rgb_prop[,3]),pch=19)
> >
> > then plot the RGB values on a 3D scatterplot. I have included
> > arguments to make the symbols the actual RGB colors that you specify
> > and their size proportional to the square root of the percentages.
> >
> > Jim
> >
> > On Wed, Dec 19, 2018 at 5:17 AM Tasha O'Hara <tasha.eileen using gmail.com>
> > wrote:
> > >
> > > Hello,
> > >
> > > I am trying to plot specific rgb color proportions of a marine
> > > specimen
> > in
> > > a stacked plot using R and I was looking for some help. I have
> > > several rgb proportions per specimen (an example of one is below).
> > > I've run into different examples of people using vegan or grDevices.
> > > Can anyone help
> > with
> > > this?
> > >
> > > Red    Green  Blue   %
> > > 249 158 37 56.311
> > > 249 158 68 4.319
> > > 249 158 98 0.058
> > > 249 128 7 13.965
> > > 249 128 37 12.87
> > > 188 128 37 0.029
> > > 249 128 68 0.161
> > > 188 128 68 0.015
> > > 188 98 7 0.029
> > > 219 128 7 2.773
> > > 219 128 37 2.583
> > > 188 98 68 0.058
> > > 219 128 68 0.525
> > > 249 188 37 0.876
> > > 249 188 68 1.08
> > > 219 98 7 0.482
> > > 249 188 98 0.015
> > > 249 158 7 3.852
> > >
> > >         [[alternative HTML version deleted]]
> > >
> > > ______________________________________________
> > > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > > and provide commented, minimal, self-contained, reproducible code.
> >
> > ______________________________________________
> > R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> > PLEASE do read the posting guide
> > http://www.R-project.org/posting-guide.html
> > and provide commented, minimal, self-contained, reproducible code.
> >
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> R-help using r-project.org mailing list -- To UNSUBSCRIBE and more, see
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> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
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