Thank you very much for the info, and excuse my confusion: I have copied
and pasted different chunks of code while trying both the ascii file and
the geotiff, which can be obtained with:
download.file(url='http://srtm.geog.kcl.ac.uk/portal/srtm41/srtm_data_geotiff/srtm_37_04.zip',destfile='srtm_37_04_tif.zip')
However, I get exactly the same problem with both files when I set up
the output.dim argument.
Jos? M.