Re: [boost] BGL - Adjusting edge weights via a ucs_visitor

From: aalness_at_[hidden]
Date: 2001-01-26 09:19:19

Sorry this was an afterthought to my last email, is there a way to visit
all the edges before insertion into the priority queue?

-Andy

On Fri, 26 Jan 2001 aalness_at_[hidden] wrote:

>
> Yes I wanted the edge weights to be dynamic in the sense that I wanted to
> keep the weights given to me by BGP but also have the option of using a
> manually given weight from another source. I thought I could do that
> durinvg the search, so I guess the only way is to actually modify the edge
> weight before doing the search? Thanks.
>
> -Andy
>
> On Fri, 26 Jan 2001, Jeremy Siek wrote:
>
> > Hi Andy,
> >
> > I'm not sure I completely understand what you are doing, but a first
> > glance one thing strikes be as odd. Are you changing the edge weights
> > *during* the search. This will invalidate the shortest-distance properties
> > of the search because inside of uniform_cost_search(), vertices are placed
> > in a priority queue based on distance (and thereby edge weight). If you
> > change edge weights, this priority queue will no longer be accurate.
> >
>
>
>
>
>

-- 
----------------------
Andrew Alness
Software Engineer
Sonicity, Inc.
aalness_at_[hidden]
"I want my two dollars." -kid on bike