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) ))
Dennis
On Wed, Nov 16, 2011 at 10:27 AM, Andy Bunn <andy.b...@wwu.edu> wrote:
>
>
>> -----Original Message-----
>> From: Dennis Murphy [mailto:djmu...@gmail.com]
>> Sent: Tuesday, November 15, 2011 8:54 PM
>> To: Andy Bunn
>> Cc: r-help@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.b...@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@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.
>> >
>
>
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