[gecode-users] changing a Space's AFC decay factor

[Christian Schulte]

Hi Kish,

Sorry, afc_deacy sets the decay factor for all propagators from which the
afc for variables is computed. When you change the decay factor, the change
is active immediate.

afc_set(a) is for changing the value for the afc: it sets the afc-value for
all propagators to a.

Cheers
Christian

--
Christian Schulte, Professor of Computer Science, KTH,
www.ict.kth.se/~cschulte/


-----Original Message-----
From: Kish Shen [mailto:kisshen at cisco.com] 
Sent: Tuesday, December 10, 2013 4:29 AM
To: cschulte at kth.se; users at gecode.org
Subject: Re: [gecode-users] changing a Space's AFC decay factor

Hi Christian,

I am not sure if I understand you correctly, but the footnote talks about
one global AFC decay factor, but the documentation refers to AFC
-- 'Reset AFC to a' -- does this AFC refers to the decay factor, rather than
the AFC values accumulated with the constraints? If so, should the
documentation be changed to mention decay factor (it does in the document
for the afc_decay() method)

If afc_set() is used to reset the decay factor, then what is the difference
from afc_decay()? Is afc_decay() used to initialise the decay factor, and
afc_set() used to change the decay factor later on?

Cheers,

Kish


On 06/12/2013 11:35, Christian Schulte wrote:
> Hi,
>
> Gecode is cheating for AFC, read footnote 1 on page 120 in MPG.
>
> I fixed the link.
>
> Cheers
> Christian
>
> --
> Christian Schulte, Professor of Computer Science, KTH, 
> www.ict.kth.se/~cschulte/
>
>
> -----Original Message-----
> From: users-bounces at gecode.org [mailto:users-bounces at gecode.org] On 
> Behalf Of Kish Shen
> Sent: Thursday, December 05, 2013 10:05 PM
> To: users at gecode.org
> Subject: [gecode-users] changing a Space's AFC decay factor
>
> Hi,
>
> I am looking at the documentation for AFC in the class documentation 
> for Space (section low-level support for AFC), and I don't understand 
> what afc_set(double a) does:
>
> The description say it 'Reset AFC to a', but I thought there is no 
> global AFC value, as each variable has its own AFC value?
>
> [Also, I noticed a possibly incorrect link in the description for 
> afc_decay(double d):
>
> the Set in 'Set AFC decay factor to d' is linked to Gecode:Set ]
>
> Cheers,
>
> Kish
>
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