[R-sig-Geo] raser::boxplot : cannot add grouping layer

[Robert J. Hijmans]

Hi Agus,
Your example works for me without error.
Can you update.packages() and try this in a clean workspace? (perhaps
another package is interfering?)
Robert

On Wed, Oct 7, 2015 at 2:44 AM, Agustin Lobo <alobolistas at gmail.com> wrote:
> According to the help page of raster::boxplot
> x: Raster* object
> y: if x is a RasterLayer object, y can be an additional RasterLayer to
> group the values of x by 'zone'
>
> but I get an error when I add a raster layer that represents a classification:
> r1 <- r2 <- r3 <- raster(ncol=10, nrow=10)
> r1[] <- rnorm(ncell(r1), 100, 40)
> r2[] <- rnorm(ncell(r1), 80, 10)
> r3[] <- rnorm(ncell(r1), 120, 30)
> s <- stack(r1, r2, r3)
> names(s) <- c('A', 'B', 'C')
>
> rc <- round(r1[[1]]/100)
> hist(rc)
> summary(rc)
>
> boxplot(s[[1]],rc)
>
> Error in as.data.frame.default(data) :
>   cannot coerce class "structure("RasterLayer", package = "raster")"
> to a data.frame
>
> Am I not interpreting what this function is supposed to do? I want to
> get the boxplot
> of the values of s by class in rc
> (i can do it having rc as an sp pol data frame and using extract,  but
> thought raster::boxplot
> would be a more direct way)
>
> Thanks
>
> Agus
>
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