Komine,

You should have checked what kind of object "test1" is (it is NULL; that is
what plot returns in this case).  You can do

test2 <- aggregate( myobject , fact=2, fun=mean)

(By the way, for xyz to raster see "rasterFromXYZ" for a regular point
pattern or "rasterize" for an irregular point pattern)

Robert

On Tue, Mar 20, 2012 at 9:47 AM, Komine <momadou@yahoo.fr> wrote:

> HI,
> I had in a excel file a data matrix: X Y Z. I created a raster with Arcgis
> then I opened it with R.
> I want to increase the resolution of my raster in order to see difference
> between
> pixel by their colors. I suppose the pixels that have the same values in
> the
> column Z, must have the same color.
> But When I used my code, I have error message:Erreur in is.function(FUN) :
> 'FUN' is not found
>
> >library(raster)
> >myobject <-raster("C:\\Users\\Desktop\\Test_R\\Freq1.tif")
> >test1<-plot(myobject)
> >test2 <- aggregate(test1, fact=2, fun=mean)
>
> Can you help me to resolve it.
> Thank you in advance
>
> --
> View this message in context:
> http://r-sig-geo.2731867.n2.nabble.com/Grid-of-raster-increase-resolution-tp7389731p7389731.html
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>
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