[R] equal spacing of the polygons in levelplot key (lattice)

[Andy Bunn]

> -----Original Message-----
> From: Dennis Murphy [mailto:djmuser at gmail.com]
> Sent: Wednesday, November 16, 2011 11:22 AM
> To: Andy Bunn
> Cc: r-help at r-project.org
> Subject: Re: [R] equal spacing of the polygons in levelplot key
> (lattice)
> 
> OK, how about this instead?
> 
> # library('lattice')
> levs <- as.vector(quantile(volcano,c(0,0.1,0.5,0.9,0.99,1)))
> levq <- seq(min(levs), max(levs), length = 6)
> levelplot(volcano, at = levs,
>            colorkey = list(at = levq,
>                                  labels = list(at = levq,
>                                                    labels = levs) ))
> 

Whoa. Tricky. That's great. Thanks!

> Dennis
> 
> On Wed, Nov 16, 2011 at 10:27 AM, Andy Bunn <Andy.Bunn at wwu.edu> wrote:
> >
> >
> >> -----Original Message-----
> >> From: Dennis Murphy [mailto:djmuser at gmail.com]
> >> Sent: Tuesday, November 15, 2011 8:54 PM
> >> To: Andy Bunn
> >> Cc: r-help at r-project.org
> >> Subject: Re: [R] equal spacing of the polygons in levelplot key
> >> (lattice)
> >>
> >> Hi:
> >>
> >> Does this work?
> >
> > Thanks Dennis.
> >
> > This almost works. Is there a way to make the rectangles in the key
> the same size? In this example five rectangles of the same area evenly
> arrayed? Can the key be coerced into being categorical?
> >
> > The data I want to work with are not spatial but it occurs to me that
> this is a common mapping task (e.g., in this example you might want to
> label these colors 'low', 'kind of low', 'medium low', etc. or map land
> covers or such.) I'll look at the sp or raster plotting equivalent.
> >
> >
> >
> >
> >
> >
> >>
> >> # library('lattice')
> >> levs <- as.vector(quantile(volcano,c(0,0.1,0.5,0.9,0.99,1)))
> >> levelplot(volcano, at = levs,
> >>             colorkey = list(labels = list(at = levs,
> >>                                                    labels = levs) ))
> >>
> >> HTH,
> >> Dennis
> >>
> >> On Tue, Nov 15, 2011 at 1:12 PM, Andy Bunn <Andy.Bunn at wwu.edu>
> wrote:
> >> > Given the example:
> >> > R> (levs <- quantile(volcano,c(0,0.1,0.5,0.9,0.99,1)))
> >> >   0%  10%  50%  90%  99% 100%
> >> >   94  100  124  170  189  195
> >> > R> levelplot(volcano,at=levs)
> >> >
> >> > How can I make the key categorical with the size of the divisions
> >> equally spaced in the key? E.g., five equal size rectangles with
> labels
> >> at levs c(100,124,170,189,195)?
> >> >
> >> > Apologies if this is obvious.
> >> >
> >> > -A
> >> >
> >> > R> version
> >> >                _
> >> >  platform       i386-pc-mingw32
> >> >  arch           i386
> >> >  os             mingw32
> >> >  system         i386, mingw32
> >> >  status
> >> >  major          2
> >> >  minor          14.0
> >> >  year           2011
> >> >  month          10
> >> >  day            31
> >> >  svn rev        57496
> >> >  language       R
> >> >  version.string R version 2.14.0 (2011-10-31)
> >> >
> >> > ______________________________________________
> >> > R-help at r-project.org mailing list
> >> > 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.
> >> >
> >
> >