[GRASS-dev] v.net.allpairs seems broken

[Moritz Lennert]

On 16/10/12 15:34, Michael Barton wrote:
> Fixing this makes the module usable. The flaw is near to a bug.

Well, you can use the module as-is. You just have to make sure that
nodes and arcs have different cat values, e.g.:

#check cat values in arcs layer (streets_wake here):
v.category streets_waks op=report

#take the existing cat values of the points in schools_wake and add 
50000 (because the cat values in streets_wake go up to just under 50000)
v.category schools_wake out=schools op=sum cat=50000

#now link the nodes with their new categories to the arcs
v.net streets_wake points=schools op=connect thresh=200 out=network 
nlayer=1

#then launch your analysis indicating the cat values of the points
v.net.allpairs network cats=50000-50167 out=allpairs

So it is possible, but should be documented.

I do agree though that it's a real PINA compared to the simple two-layer 
system in other modules.

Moritz

>
> +1
>
> Michael ____________________ C. Michael Barton Director, Center for
> Social Dynamics&  Complexity Professor of Anthropology, School of
> Human Evolution&  Social Change Arizona State University
>
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>
>
>
> On Oct 16, 2012, at 4:12 AM, Moritz
> Lennert<mlennert at club.worldonline.be> wrote:
>
>> Or we decide to break the rule to not change options and backport
>> the alayer/nlayer patches from grass 7 to grass 6, as it is such an
>> obvious design flaw compared to the general logic of the v.net.*
>> modules.
>>
>> What do you think ?
>