[R-sig-Geo] problem with expand function (raster package)

[Julian Burgos]

Dear list,

I cannot figure this out.  I am trying to extend a raster object, using 
the "extend" function (from the raster package), but the extension of 
the raster does not change.  Here is an example:

##############################
set.seed(100)
myraster <- raster(ncols=4, nrows=4)
myraster[] <-  sample(1:10,ncell(eff),replace=T)
extent(myraster)

ex <- extent(myraster)+2
eff <- expand(myraster, ex)
extent(myraster)
##############################

As you can see, the extent of "myraster" does not change.   What I am 
doing wrong?
Many thanks,

Julian

-- 
Julian Mariano Burgos, PhD
Hafrannsóknastofnunin/Marine Research Institute
Skúlagata 4, 121 Reykjavík, Iceland
Sími/Telephone : +354-5752037
Bréfsími/Telefax:  +354-5752001
Netfang/Email: julian at hafro.is