[R-sig-Geo] Change range of values of the legend

[Ben Tupper]

Hi,

Try 

plot(rast, zlim = c(-5, 5))

I think the zlim argument is passed through to graphics::image() via fields::image.plot() which raster::plot() calls.  I know it isn't super obvious until until you re-read the docs about 2000 times.

Cheers,
Ben 


> On Feb 9, 2018, at 9:39 AM, Stefano Sofia <stefano.sofia at regione.marche.it> wrote:
> 
> Dear list users,
> suppose that I have this simple raster:
> 
> library(raster)
> xy <- matrix(rnorm(400),20,20)
> rast <- raster(xy)
> 
> plot(rast) gives me a legend with range (-3,3).
> I would like to change the range of the legend to (-5,5), for example. I tried with
> 
> plot(rast, legend=FALSE, axes=FALSE)
> r.range <- c(-5, 5)
> plot(rast, legend.only=TRUE, axis.args=list(at=seq(r.range[1], r.range[2], 1), labels=seq(r.range[1], r.range[2], 1)))
> 
> but this does not expand the values of the legend.
> Could somebody give me some hints?
> 
> Thank you
> Stefano
> 
> 
>         (oo)
> --oOO--( )--OOo----------------
> Stefano Sofia PhD
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Ben Tupper
Bigelow Laboratory for Ocean Sciences
60 Bigelow Drive, P.O. Box 380
East Boothbay, Maine 04544
http://www.bigelow.org

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