[GRASS-dev] Re: [R-sig-Geo] Plan to build Package to use GRASS from R

[Roger Bivand]

On Thu, 28 Feb 2008, Rainer M Krug wrote:

> On 28/02/2008, Roger Bivand <Roger.Bivand at nhh.no> wrote:
>>
>> On Wed, 27 Feb 2008, Rainer M Krug wrote:
>>
>>> Hi
>>>
>>> Sorry for crossposting, but I think this can be of interest for GRASS
>> and R
>>> users.
>>
>>
>> Yes, please avoid cross-posting - the discussion ends up on many different
>> lists and threading can break down if the threading implementation in mail
>> clients and archives doesn't like cross-posting.
>
>
> OK - I'll avoid it in the future and continue this thread on grass-dev.
>
> The only complete thread I have found is on Nabble at:
>>
>>
>> http://www.nabble.com/Plan-to-build-Package-to-use-GRASS-from-R-tt15712877.html#a15712877
>>
>> for the grass-dev list.
>>
>> In summary, the problems are mostly those of appropriately quoting shell
>> commands through system() across platforms. Those interested should follow
>> the discussion on grass-dev.
>>
>> The correct lists could be either here, or the grass-stats list; could
>
>
> I think I will leave it at the grass-dev list, altohough it concerns grass
> and R - it is more a devel issue then for the grass-stats list.
>
> Rainer post a summary to both (hopefully in-thread) on conclusion?
>
>
> OK - I will do so as soon some ideas and further palns emerge.
>
> If I have a working solution, would it be possible to include it into the
> spgrass6 package?

It is actually to some extent a re-write of spgrass6, using other 
mechanisms to run the GRASS commands. In that context, yes, I'd be 
interested. See my post on grass-dev (I'm reading there digested at 
present).

Roger

>
> Thanks
>
> Rainer
>
>
> Roger
>>
>>
>>>
>>> I am planning to write a package to make the use of GRASS from R easier.
>> The
>>> idea is to wrap the system call to execute the GRASS command into an R
>>> command of the same name.
>>> e.g:
>>> r.to.vect <- function(..., intern=TRUE, ignore.stderr=FALSE)
>>>  {
>>>    comm <- paste( "r.to.vect ", ..., sep="" )
>>>    print(comm)
>>>    system( comm, intern=intern, ignore.stderr=ignore.stderr )
>>>  }
>>>
>>> My questions are:
>>>
>>> 1) Is this a good way of doing it, or is giving a named list to the
>> function
>>> more usefull?
>>> 2) Is there a way to obtain easily all commands from GRASS and the
>>> parameters possible and required?
>>>
>>> Any ideas and comments welcome,
>>>
>>> Rainer
>>>
>>>
>>>
>>
>> --
>>
>> 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
>>
>>
>
>
>

-- 
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