[R-sig-Geo] package raster: issue with "extent" and "stack"

[Robert Hijmans]

Advait, 

> I encounter two errors; A) when using extent to crop the rasters 

> lims <- extent(rcmraster,180,185,300,305) 
> Error in .local(x, ...) : unused argument(s) (180, 185, 300, 305) 

> I also tried using lat-long values in place of the index to no avail. 

I cannot reproduce the problem.  You are not providing your sessionInfo(),
but I can see that you are not using the last version of raster. Perhaps
this problem goes away if you update raster.  It is also good practice to
provide to make some effort to provide a self contained example of the
problem encountered. Such as below (which suggest to me that this works):

> r <- raster(nrow=356, ncol=507)
> r[] <- 1:ncell(r)
> s <- stack(r,r,r)
> lims <- extent(r,180,185,300,305) 
> lims
class       : Extent 
xmin        : 32.66272 
xmax        : 36.21302 
ymin        : -3.286517 
ymax        : -0.758427 


if you use long/lat you would need to do something like

lims <- extent(-100, -50, 30, 40) 


and B) using stack 

s_crop <- stack(emitraster,rcmraster) 
Error in function (classes, fdef, mtable)  : 
  unable to find an inherited method for function "trim", for signature 
"integer"  

I do not know what you are trying to do here. Did you mean

s_crop <- crop(emitraster,rcmraster)   # ?

Anyway, this works for me, 

> b <- brick(s)
> ss <- stack(b,b)

But this probably goes wrong because you are using ncdf files; so that might
be a bug. I would happily download and look at those files if you could
establish first that the simple examples works for you like they work for
me, but things break if you use the files instead; and that you are using
the latest version. 

Best, 
Robert






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