[GRASS-dev] Re: Problem when loading GRASS 6 raster with large integer values into R via r.out.bin

[Roger Bivand]

On Wed, 24 Sep 2008, Rainer M Krug wrote:

> On Wed, Sep 24, 2008 at 4:45 AM, Hamish <hamish_b at yahoo.com> wrote:
>>>> Concerning trapping of the verbose messages, I think it would be a
>>>> good idea to do the following:
>>>>
>>>> 1) add a parameter verbose=TRUE in readRAST6 and writeRAST6 to enable
>>>> or disable it
>> Roger:
>>> I'll try to do this using the existing ignore.stderr= in system(), but
>>> it may not stop everything.
>>
>> When possible it should utilize the --quiet and --verbose flags which all
>> GRASS modules listen for, or set the GRASS_VERBOSE environment variable
>> to the required level. Blindly throwing all stderr messages to /dev/null
>> should be a last resort, there may be something important there.
>
> I think that's a good idea - to use the same standard flags that GRASS
> is also using (including the --overwrite which would be nice to have
> in the writeRAST6 by the way).
> I will keep that approach in mind for other commands interfacing to GRASS.

Yes in principle, but do we know whether users are still on 6.2, or have 
migrated to 6.3 and there is no further need to condition on feature 
creep? Remember that the R/GRASS interface isn't GRASS, it's an interface. 
I can look at reading the GRASS_VERBOSE shell variable and using it to set 
verbosity if present. The -q versus --q change killed the tests/examples 
when it happened, so I'd prefer conservatism (do nothing) to using GRASS 
facilities that vary between GRASS versions.

Roger

>
> Rainer
>
>
>>
>>
>> Hamish
>>
>>
>>
>>
>>
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>
>
>
>

-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no