[R] ggplot2: discontinuous ribbon

[Thierry Onkelinx]

Dear Sebastien,

You are looking for geom_polygon().

Best regards,

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium

To call in the statistician after the experiment is done may be no more
than asking him to perform a post-mortem examination: he may be able to say
what the experiment died of. ~ Sir Ronald Aylmer Fisher
The plural of anecdote is not data. ~ Roger Brinner
The combination of some data and an aching desire for an answer does not
ensure that a reasonable answer can be extracted from a given body of data.
~ John Tukey

2015-10-21 11:20 GMT+02:00 sbihorel <Sebastien.Bihorel op cognigencorp.com>:

> Hi
>
> I would like to use ggplot2 to create a 2d plot showing a series of shaded
> areas that are not continuous with respect to the x-axis variable. The
> expected result is illustrated below using lattice/grid functions.
>
> -------------
> pdata <- data.frame(
>   x=c(1,2,2,1,NA,3,4,4,3,NA,5,6,6,5),
>   y=c(3,3,2,2,NA,2,2,1,1,NA,2.5,3,2,2))
>
> lattice::xyplot((1:6)~(1:6),panel=function(pdata=pdata){
>   grid::grid.polygon(pdata$x,pdata$y,
>                default.units='native',
>                gp=grid::gpar(fill=1,col=NULL,lty=0))
> },pdata=pdata)
> -------------
>
> Here is my attempt to reproduce this plot in ggplot.
>
> -------------
> library(ggplot2)
> data <- data.frame(
>   x=c(1,2,NA,3,4,NA,5,6),
>   ymin=c(2,2,NA,1,1,NA,2,2),
>   ymax=c(3,3,NA,2,2,NA,2.5,3)
> )
>
> ggplot(data,aes(x=x))+geom_ribbon(aes(ymin=ymin,ymax=ymax))
> -------------
>
> Obviously, either geom_ribbon expects continuity in the data or I need to
> setup my data and/or call differently...
>
> Thanks for your help
>
> Sebastien
>
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