[GRASS-user] The algorithm r.cost is not working

[Markus Metz]

On Wed, Feb 22, 2012 at 11:31 AM, Elisa Solano Villareal
<villareal at fbk.eu> wrote:
> Thanks for your answer.
>
>> The cost surface used as input
>> for r.cost must have only positive values, negative values will cause
>> infinite loops. Please make sure your input cost surface has only
>>positive values.
>
>  but we have seen our data and it doesn't have negative values, the minimun value is 0.
>
>> r.cost has changed a bit lately, in particular since GRASS version
>> 6.4.0. Please use 6.4.2 if possible.
>
> We did it but.. we found this message r.cost: malloc.c:4471: _int_malloc: Assertion '(bck->size & 0x4) == 0' failed.

Can you try r.cost with percent_memory=30 (default is 100)?

Markus M

>
> Please, can you give more information.
>
> Thanking you in advance,
>
> Elisa
>
> ________________________________________
> From: Markus Metz [markus.metz.giswork at googlemail.com]
> Sent: Tuesday, February 14, 2012 12:39 PM
> To: Elisa Solano Villareal
> Cc: grass-user at lists.osgeo.org
> Subject: Re: [GRASS-user] The algorithm r.cost is not working
>
> On Tue, Feb 14, 2012 at 11:56 AM, Elisa Solano Villareal
> <villareal at fbk.eu> wrote:
>> Hi there,
>>
>> I have a question, I am working with r.cost algotithm but is not running for my whole spatial data but when a put just a piece of the map it works.
>>
>> The main problem is that the algorithm does not finish, but it seems as keeping running 112%, 115%,120%...
>>
>> My version is 6.4 and the bigest cost raster size is  6085, 6823 for the starting points are 1727.
>
> r.cost has changed a bit lately, in particular since GRASS version
> 6.4.0. Please use 6.4.2 if possible. The cost surface used as input
> for r.cost must have only positive values, negative values will cause
> infinite loops. Please make sure your input cost surface has only
> positive values. If the problem persists, it would be great if you
> could provide a sample script and/or sample data to reproduce the
> problem. At least in 6.4.2 r.cost is working fine.
>
>>
>> Grass showed also this message: Dev note: Adapted sites library used for vector points. (module should be updated to GRASS 6 vector library). As the matter of fact, we are no sure if it is the real problem.
>
> No, this is not a problem.
>
> Markus M
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