Hello,
thanks a lot for the fast response and the hint! Actually, it helped to
already integrate as.factor in the generation of the raster. This is
also working for uploading or diverse other raster functionalities like
projection, e.g. as.factor(raster("C:\\...\\r.tiff")) or
as.factor(projectRaster(r, to, method='ngb'))
Furthermore I found in another blog (Dec 2013), following:
This [the as.factor(raster)] is a bug in package raster.
Once again, thanks a lot!
Best,
Stefan
Am 06.05.2014 20:27, schrieb David L Carlson:
Does
values(r) <- as.factor(1:ncell(r))
do what you want?
-------------------------------------
David L Carlson
Department of Anthropology
Texas A&M University
College Station, TX 77840-4352
----Original Message-----
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf Of Stefan Schmidt
Sent: Tuesday, May 6, 2014 11:22 AM
To: r-help@r-project.org
Subject: [R] conversion error from numeric to factor in raster: Error in
1:ncol(r) : argument of length 0, r command: as.factor()
Hello together,
I was wondering how I can solve the following conversion problem of a
raster file: when I try to convert the values from the raster (r) from
numeric into a factor via as.factor(r) always the error appears: "Error
in 1:ncol(r) : argument of length 0".
r <- raster(ncol=5, nrow=5)
values(r) <- 1:ncell(r)
as.factor(r)
Urgently I have to figure out how to convert a numeric raster into a
factor raster for a predict() calculation within the raster package.
Every hint is very welcome!
Best,
Stefan
--
********************************************************************
Stefan Schmidt
Abteilung Landschaftsökologie/
Department Computational Landscape Ecology
Helmholtz-Zentrum für Umweltforschung GmbH – UFZ/
Helmholtz Centre for Environmental Research – UFZ
Permoserstraße 15 / 04318 / Leipzig
Phone: +49 341 235 - 1056
Fax: +49 341 235 - 1939
Email: stefan.schm...@ufz.de
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