R help - Jun 2008 - Level Plot and Scale of Colorkey

I am drawing level plots but I would like to specify the range of the colorkey,
I am not having any success figuring this out so any help would be greatly
appreciated!

Here is an example of what I am trying to do:

disp<-1

x <- seq(1, 10,by=1) 
y <- seq(1,10,by=1)
g <- expand.grid(x = x, y = y)
g$z <- 1/exp((abs(g$x-5)+abs(g$y-5))*disp)
g$z<-g$z/sum(g$z)

levelplot(z ~ x * y, g,xlab="x co-ordinate", ylab="y
co-ordinate" ,colorkey=TRUE,col.regions=(col=gray((0:32)/32)))

I would like to enforce the number of divisions on the colorkey scale and the
size ? so for example from 0 to 0.1 in increments of 0.02 (just as an example).

I apologize if this is an obvious question but I have read the documentation and
scoured the archives and cannot figure it out.




      __________________________________________________________
can.html

Try

colscaledivs=100		#colscaledivs=15 here is the R default
levelplot(z ~ x * y, g,xlab="x co-ordinate",ylab="y
co-ordinate",colorkey=TRUE,at=seq(from=-0.01,to=0.25,length=colscaledivs),col.regions=(col=gray((0:colscaledivs)/colscaledivs)))

Toby Marthews


Le Ven 13 juin 2008 18:50, emma hartnett a ?crit :
> I am drawing level plots but I would like to specify the range of the
> colorkey, I am not having any success figuring this out so any help would
> be greatly appreciated!
>
> Here is an example of what I am trying to do:
>
> disp<-1
>
> x <- seq(1, 10,by=1)
> y <- seq(1,10,by=1)
> g <- expand.grid(x = x, y = y)
> g$z <- 1/exp((abs(g$x-5)+abs(g$y-5))*disp)
> g$z<-g$z/sum(g$z)
>
> levelplot(z ~ x * y, g,xlab="x co-ordinate", ylab="y
co-ordinate"
> ,colorkey=TRUE,col.regions=(col=gray((0:32)/32)))
>
> I would like to enforce the number of divisions on the colorkey scale and
> the size ? so for example from 0 to 0.1 in increments of 0.02 (just as an
> example).
>
> I apologize if this is an obvious question but I have read the
> documentation and scoured the archives and cannot figure it out.
>
>
>
>
>       __________________________________________________________
> can.html
>
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