[pgrouting-users] Dynamic costs question

Alex D. kmortyk at gmail.com
Mon Sep 4 06:06:28 PDT 2023

Thank you for your reply.

Is it possible to find someone here who can develop this feature for a fee,
with the intention of releasing the final solution as open source?

I am currently considering two potential approaches for implementation:

1. Implementing the Bellman-Ford Based Algorithm as described in the
following paper:
time-dependent shortest paths over large graphs) and
https://essay.utwente.nl/92401/ (Solving time-dependent shortest path
problems in a database context).

2. Implementing callbacks for
https://docs.pgrouting.org/latest/en/pgr_bellmanFord.html, as discussed in
the issue https://github.com/pgRouting/pgrouting/issues/243.

вс, 3 сент. 2023 г. в 04:50, Vicky Vergara <vicky at erosion.dev>:

> Hello,
> No, we do not have an implementation where costs can vary while executing
> the algorithm.
> If you can point out a paper of such an algorithm you describe, it would
> be nice.
> Regards
> Vicky
> On Fri, Sep 1, 2023 at 1:00 AM Alex D. <kmortyk at gmail.com> wrote:
>> Dear pgRouting users,
>> I am currently working on my project and would like to learn more about
>> the library. Specifically, I am using it to find the most profitable paths
>> between two tokens.
>> The graph I am working with represents tokens between which transfers on
>> the Ethereum blockchain are possible.
>> Could you please help me with the following questions:
>> 1. Is it possible to use dynamic costs in path finding algorithms,
>> specifically in pgr_bellmanFord? By dynamic costs, I mean modifying the
>> cost of an edge as the algorithm passes through the graph based on
>> previously added edges in the path.
>> 2. If dynamic costs are not possible, is it correct to say that this is
>> the problem of finding paths in time-dependent graphs? I am unsure because
>> in my case, it is possible for the weight to decrease as the algorithm
>> travels along the edges.
>> Thank you very much.
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>> Pgrouting-users at lists.osgeo.org
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