Hi Matt,
That is a bug with caused by sampleRegular with a RasterStack, when using
gdal to read the files. Fixed in version 2.0-03. Thanks for reporting.
Robert


On Thu, Jun 14, 2012 at 10:51 AM, Matt Landis <landis@isciences.com> wrote:

> Hello all,
>
> I am tempted to use spplot with a RasterStack, but for some reason, I
> keep getting an error.  Maybe someone out there has experienced the
> same thing?  See below.
>
> st <- created from 9 IMG files
>
> > st
> class       : RasterStack
> dimensions  : 360, 720, 259200, 9  (nrow, ncol, ncell, nlayers)
> resolution  : 0.5, 0.5  (x, y)
> extent      : -180, 180, -90, 90  (xmin, xmax, ymin, ymax)
> coord. ref. : +proj=longlat +datum=WGS84 +no_defs +ellps=WGS84
> +towgs84=0,0,0
> min values  : 0.010, 0.010, 0.010, 0.010, 0.010, 0.055, 0.019, 0.053, 0.015
> max values  : 0.99, 0.99, 0.99, 0.99, 0.99, 0.98, 0.98, 0.99, 0.99
> layer names : Jul.2012, Aug.2012, Sep.2012, Oct.2012, Nov.2012,
> Dec.2012, Jan.2013, Feb.2013, Mar.2013
>
> > spplot(st)
> Error in nchar(filename) :
>  no slot of name "file" for this object of class "RasterStack"
> In addition: Warning message:
> In if (rotated | cells | (.driver(x, FALSE) != "gdal")) { :
>  the condition has length > 1 and only the first element will be used
>
> However
> > spplot(as(st, 'SpatialGridDataFrame'))
> >
> is successful.
>
> I am able to run the example in the spplot raster documentation with no
> errors.
>
> > r <- raster(system.file("external/test.grd", package="raster"))
> > s <- stack(r, r*2)
> > layerNames(s) <- c('meuse', 'meuse x 2')
> >
> > spplot(s)
> >
>
> I am running on Windows Server 2008 R2, plus...
> > sessionInfo()
> R version 2.15.0 (2012-03-30)
> Platform: x86_64-pc-mingw32/x64 (64-bit)
>
> locale:
> [1] LC_COLLATE=English_United States.1252  LC_CTYPE=English_United
> States.1252
> [3] LC_MONETARY=English_United States.1252 LC_NUMERIC=C
> [5] LC_TIME=English_United States.1252
>
> attached base packages:
> [1] grid      stats     graphics  grDevices utils     datasets
> methods   base
>
> other attached packages:
> [1] rgdal_0.7-11        zoo_1.7-7           rasterVis_0.10-9
> hexbin_1.26.0       latticeExtra_0.6-19
> [6] RColorBrewer_1.0-5  lattice_0.20-6      raster_1.9-92
> sp_0.9-99
>
> loaded via a namespace (and not attached):
> [1] tools_2.15.0
>
>
> --
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Matthew Landis, Ph.D.
> Research Scientist
> ISciences, LLC
> 61 Main St., Suite 200
> Burlington VT 05401
>
> 802-864-2999
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
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>

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