Hi,

Finally, I found how to do it.

Using break argument in plot function.

2012/5/23 Mathieu Rajerison <mathieu.rajerison@gmail.com>

> Hi,
>
>
> I have a raster r that 'd like to superimpose on another raster with
> adjusted alpha values.
>
> The color would be black
>
> If I do:
> pal <- sapply(0:100, function(x) rgb(0,0,0,x/100))
> plot(r, col=pal)
>
> , my palette is adjusted with alpha values by equal interval distribution.
>
> Is there a way to plot the raster with another classification, by example
> jenks?
>
>
> Any help would be greatly appreciated,
>
> Mathieu
>

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