Rainer Krug wrote:
> do the modules of R (e.g. r.stats, ...) have return values
> which I can evaluate to find out if the execution was successful?
Yes. GRASS modules all return 0 on success and 1 on failure.
> I would like to use these "return values on error" to evaluate the
> success of the command when called from R.
In most cases you can trust that method. Maybe 1% of modules use a
different failure code, if so it's a bug & please report it.
Some/many of the internal C functions will use 1 as success, but they
will typically be called G_is_something() and return a boolean result.
The lib fns return all sorts of things, always check before using them.
Hamish
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