Hi Jeremy, Thanks for your email. No, I haven't tried implementing Yen or Eppstein in BGL. I was hoping to use something that already exist. I guess I'll just go for edge-disjoint shortest paths with the min-cost max-flow algorithm already present in Boost, i.e.: successive_shortest_path_nonnegative_weights Best, Irek On 11.10.2015 08:36, Jeremy Murphy wrote:

Hi Irek,

On 8 October 2015 at 23:43, Ireneusz Szcześniak mailto:irek.szczesniak@gmail.com> wrote:

I need to find k-shortest paths, but there is no such algorithm in BGL. I can get edge-disjoint k-shortest paths with a max-flow algorithm, but I don't need the k-shortest path to be edge-disjoint -- that's too strict for me.

I would appreciate it if someone could share an implementation of the Yen or Eppstein algorithms using BGL. I found some implementations on the Internet, but they don't use BGL.

As you may already know, Eppstein and Yen algorithms are different with respect to loops, so be sure which one you need.

You may also wish to consider K*: http://www.sciencedirect.com/science/article/pii/S0004370211000865

You don't have to be a BGL guru to implement algorithms that work on BGL graphs: have you tried giving it a go? Admittedly, you have piqued my curiosity and now I will probably have a go.

Cheers.

Jeremy

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Hi Vicky, Thanks for the pointer, but I didn't find in your code the implementation of the Yen algorithm using Boost. There was an implementation, but without Boost. Could you please point to the exact implementation? Thanks, Irek On 20.10.2015 18:02, Vicky Vergara wrote:

You can find an implementation of Yen Algorithm using Boost.Graph in pgRouting http://pgrouting.org/ In version 2.1 which is the latest release, can be found here: https://github.com/pgRouting/pgrouting/releases/tag/pgrouting-2.1.0

...

Date: Mon, 12 Oct 2015 14:35:52 +0200 From: irek.szczesniak@gmail.com To: boost-users@lists.boost.org Subject: Re: [Boost-users] [BGL] k-shortest path

Hi Jeremy,

Thanks for your email. No, I haven't tried implementing Yen or Eppstein in BGL. I was hoping to use something that already exist.

I guess I'll just go for edge-disjoint shortest paths with the min-cost max-flow algorithm already present in Boost, i.e.:

successive_shortest_path_nonnegative_weights

Best, Irek

...

Hi Irek,

On 8 October 2015 at 23:43, Ireneusz Szcześniak mailto:irek.szczesniak@gmail.com> wrote:

I need to find k-shortest paths, but there is no such algorithm in BGL. I can get edge-disjoint k-shortest paths with a max-flow algorithm, but I don't need the k-shortest path to be edge-disjoint -- that's too strict for me.

I would appreciate it if someone could share an implementation of the Yen or Eppstein algorithms using BGL. I found some implementations on the Internet, but they don't use BGL.

As you may already know, Eppstein and Yen algorithms are different with respect to loops, so be sure which one you need.

You may also wish to consider K*: http://www.sciencedirect.com/science/article/pii/S0004370211000865

You don't have to be a BGL guru to implement algorithms that work on BGL graphs: have you tried giving it a go? Admittedly, you have

On 11.10.2015 08:36, Jeremy Murphy wrote: piqued

...

my curiosity and now I will probably have a go.

Cheers.

Jeremy

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Hi Vicky, Thank you for the guide. Maybe I'll look deeper into your code, but at first glance, it seems difficult to disentangle the Yen from your data structures, and make it pure Boost. Maybe I'll implement Yen myself. Thanks & best, Irek W dniu 23.10.2015 o 23:05, Vicky Vergara pisze:

Hello Irek:

Sorry for the complex implementation we have.

The main idea is that the data is on a data base so you call using an SQL query.

ksp= k shortest Paths

The main directory is: https://github.com/pgRouting/pgrouting/tree/master/src/ksp/src the ksp.h & ksp.h are for linking into the database

This one: https://github.com/pgRouting/pgrouting/blob/master/src/ksp/src/ksp_driver.cp... Is where the data we got from the data base gets passed to the algorithm

Here is the algorithm: https://github.com/pgRouting/pgrouting/blob/master/src/ksp/src/pgr_ksp.hpp https://github.com/pgRouting/pgrouting/blob/master/src/ksp/src/pgr_ksp.hpphttps://github.com/pgRouting/pgrouting/blob/master/src/ksp/src/pgr_ksp.cpp

In this line : https://github.com/pgRouting/pgrouting/blob/master/src/ksp/src/pgr_ksp.hpp#L...

we include the following file: https://github.com/pgRouting/pgrouting/blob/master/src/dijkstra/src/pgr_dijk... because we use dijkstra.

And https://github.com/pgRouting/pgrouting/blob/master/src/common/src/baseGraph.... is a wrapper that simplifies boost.Graph to what we use.

I hope this "small guide" helps.

Vicky

...

Date: Fri, 23 Oct 2015 22:13:47 +0200 From: irek.szczesniak@gmail.com To: boost-users@lists.boost.org Subject: Re: [Boost-users] [BGL] k-shortest path

Hi Vicky,

Thanks for the pointer, but I didn't find in your code the implementation of the Yen algorithm using Boost. There was an implementation, but without Boost.

Could you please point to the exact implementation?

Thanks, Irek

On 20.10.2015 18:02, Vicky Vergara wrote:

...

You can find an implementation of Yen Algorithm using Boost.Graph in pgRouting http://pgrouting.org/ In version 2.1 which is the latest release, can be found here: https://github.com/pgRouting/pgrouting/releases/tag/pgrouting-2.1.0

...

Date: Mon, 12 Oct 2015 14:35:52 +0200 From: irek.szczesniak@gmail.com To: boost-users@lists.boost.org Subject: Re: [Boost-users] [BGL] k-shortest path

Hi Jeremy,

Thanks for your email. No, I haven't tried implementing Yen or Eppstein in BGL. I was hoping to use something that already exist.

I guess I'll just go for edge-disjoint shortest paths with the min-cost max-flow algorithm already present in Boost, i.e.:

successive_shortest_path_nonnegative_weights

Best, Irek

On 11.10.2015 08:36, Jeremy Murphy wrote:

...

Hi Irek,

On 8 October 2015 at 23:43, Ireneusz Szcześniak mailto:irek.szczesniak@gmail.com> wrote:

I need to find k-shortest paths, but there is no such algorithm in BGL. I can get edge-disjoint k-shortest paths with a max-flow algorithm, but I don't need the k-shortest path to be edge-disjoint -- that's too strict for me.

I would appreciate it if someone could share an implementation of the Yen or Eppstein algorithms using BGL. I found some implementations on the Internet, but they don't use BGL.

As you may already know, Eppstein and Yen algorithms are different with respect to loops, so be sure which one you need.

You may also wish to consider K*:

http://www.sciencedirect.com/science/article/pii/S0004370211000865

...

You don't have to be a BGL guru to implement algorithms that

...

BGL graphs: have you tried giving it a go? Admittedly, you have

work on piqued

...

my curiosity and now I will probably have a go.

Cheers.

Jeremy

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Hi Irek, On 22 November 2015 at 19:11, Ireneusz Szcześniak

wrote:

Hi Jeremy and others,

I implemented the edge-disjoint KSP, but without a min-cost max-flow algorithm. You can find the implementation here:

https://svn.boost.org/trac/boost/ticket/11804

That's great, it looks good. I don't have time to take a detailed look at it right now, but at first glance, I'm wondering whether you really have to use multimap, set and list? Have you benchmarked against a different implementation using a data structure with better locality of storage (e.g. vector)?

Jeremy, did you try to implement Yen? I think I'll have a stab at it.

No, not yet, I've been busy with polynomial division in Boost.Math. I probably won't really have time to look at it for a few weeks. Cheers. Jeremy

Hi Jeremy and others, FYI, I implemented the Yen algorithm: https://svn.boost.org/trac/boost/ticket/11838 Best, Irek On 11.10.2015 08:36, Jeremy Murphy wrote:

Hi Irek,

On 8 October 2015 at 23:43, Ireneusz Szcześniak mailto:irek.szczesniak@gmail.com> wrote:

I need to find k-shortest paths, but there is no such algorithm in BGL. I can get edge-disjoint k-shortest paths with a max-flow algorithm, but I don't need the k-shortest path to be edge-disjoint -- that's too strict for me.

I would appreciate it if someone could share an implementation of the Yen or Eppstein algorithms using BGL. I found some implementations on the Internet, but they don't use BGL.

As you may already know, Eppstein and Yen algorithms are different with respect to loops, so be sure which one you need.

You may also wish to consider K*: http://www.sciencedirect.com/science/article/pii/S0004370211000865

You don't have to be a BGL guru to implement algorithms that work on BGL graphs: have you tried giving it a go? Admittedly, you have piqued my curiosity and now I will probably have a go.

Cheers.

Jeremy

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