[GRASS-dev] select issue with wingrass

[Moritz Lennert]

Michael Barton wrote:
> 
> 
> On 11/12/07 4:14 AM, "Glynn Clements" <glynn at gclements.plus.com> wrote:
> 
>> Michael Barton wrote:
>>
>>> It appears that r.mapcalc is NOT working. We get an error with even the
>>> simplest of mapcalc statements. Javi will send the error message tonight or
>>> tomorrow, but it is a red herring IMHO, stating that it is missing an "=".
>>> We have the same error if we run r.mapcalc via the TclTk interface
>>> (r.mapcalculator) or run it from the console command line. Other commands
>>> work find from the console command line. This is *critical*, of course, as
>>> r.mapcalc is very important to GRASS analysis and map management.
>> FWIW, the only r.mapcalc files which have changed in the last three
>> months are:
>>
>> Makefile
>> map3.c
>> r.mapcalc.html
>> r3.mapcalc.html
>>
>> The Makefile changes were part of the parallel build effort, and don't
>> change what is compiled or which switches are used. The map3.c changes
>> are just standardisation of messages, and only affect r3.mapcalc.
>>
>> I presume that this is related to your local environment; otherwise, I
>> would expect to see other people reporting it.
> 
> Unfortunately, not many people testing new WinGRASS alpha builds yet I fear.
> 
> I did some more tests this morning, this time on my Mac and may have
> discovered the cause of the error.
> 
> For the current WinGRASS binary, it is necessary to use the command console
> for command-line use of GRASS.
> 
> We received an error with the following simple mapcalc statements
> 
> r.mapcalc 'frict=1'
> r.mapcalc 'test=pendiente*2'
> 
> It turns out that you cannot use single quotes in this context. You need to
> use regular quotes. So the way to specify the same mapcalc statements from
> the GUI command console is...
> 
> r.mapcalc "frict=1"
> r.mapcalc "test=pendiente*2"
> 
> I thought we had tried double quotes too, but maybe we didn't. I'll wait for
> Javi to check email and test. The worrisome thing is that we initially used
> the GUI map calculator from the menu and got an error. I tried it this
> morning on my Mac and did not get an error.

In windows you don't need any quotation marks, so

r.mapcalc frict=1 also works, as does r.mapcalc x=frict/3.

The only issue might be special characters which you would have to 
escape somehow.


Moritz