R help - Jun 2012 - Edges and Rasters

Hi everyone!

I would like to draw a line surrounding my raster, with i want it in black, 
and i don't know if its possible to change the colour.

A simple example is:

r <- raster(nrow=30, ncol=30, xmn=0)
r[]<-NA
r[393:409]<-99
r[423:439]<-99
r[453:455]<-99
r[456:460]<-30
r[461:469]<-99
r[483:499]<-99
r[513:529]<-99
plot(r,col=terrain.colors(100))
plot( edge(r, type='outer'))

Could anyone help me??
Thanks

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Here's one way to do it, preserving your original approach as much as
possible. (Note: I'm not sure how well "transparent" is supported
on
other devices or OSs [I'm using Cairo on Linux], but since you don't
say what you're using it's impossible to provide a definite solution.)

plot(r,col=terrain.colors(100))
plot(edge(r, type="outer"), col=c("transparent",
"black"), add=TRUE,
legend=FALSE)

If this doesn't work for you because of problems with
"transparent",
you can also change the 0 values in edge(r) to NA so they won't be
plotted.

Sarah

On Wed, Jun 20, 2012 at 9:19 AM, riodementa <jorge.nayamacias at
gmail.com> wrote:
> Hi everyone!
>
> I would like to draw a line surrounding my raster, with i want it in black,
> and i don't know if its possible to change the colour.
>
> A simple example is:
>
> r <- raster(nrow=30, ncol=30, xmn=0)
> r[]<-NA
> r[393:409]<-99
> r[423:439]<-99
> r[453:455]<-99
> r[456:460]<-30
> r[461:469]<-99
> r[483:499]<-99
> r[513:529]<-99
> plot(r,col=terrain.colors(100))
> plot( edge(r, type='outer'))
>
> Could anyone help me??
> Thanks
>
-- 
Sarah Goslee
http://www.functionaldiversity.org