[Freeciv-Dev] Re: [Wishlist] Attitude manager (agent and AI)

[Gregory Berkolaiko <Gregory.Berkolaiko@xxxxxxxxxxxx>]

On Mon, 4 Mar 2002, Raimar Falke wrote:

> On Mon, Mar 04, 2002 at 12:11:28PM +0000, Gregory Berkolaiko wrote:
> > This is related to an earlier email by Raimar.  He was talking about
> > displaying the effect a building like Marketplace would have.  Well,
> > Marketplace is an easy one to estimate for anyone (incl. AI) who knows
> > about the notion of "percent".  But the effect of, say, Cathedral, is more
> > involved.
> 
> Maybe you have misunderstood me. I don't want to do something like

I didn't discuss the _way_ you would implement it, I merely said that 
evaluating Marketplace (in the curresnt ruleset) is an easy problem for a 
numerate user.  Admittedly, I did not think about generalised rulesets.

Speaking about _way_ of implementing it, the second way is much cleverer.  
For some buildings, that is.  See below.

>   gold_of_marketplace = gold_multiplicator * base_gold
> I want to do something like
>   memcpy(backup, pcity);
>   pcity->improvements[i]=1;
>   refresh_city(pcity);
>   y = create_diff(backup, pcity);
>   memcpy(pcity, backup);
> 
> The first will lead to code duplication. The second will also work if
> the code doesn't know about the latest effect.
> 
> In general I would a function like:
>   k = get_diff(pcity, B_MARKETPLACE, GOLD);
> would be ok. It doesn't matter how it is implemented.
> 
> > So I would suggest the following extension to the CMA: once the
> > target multipliers are set, you should be able to evaluate the
> > effect of building a happiness-related improvement.  It would output
> > (for user) the increase in surpluses you'd be able to get (maybe
> > minus the cost of the upkeep).  And for AI you just need to combine
> > the values of increases multiplied by their _WEIGHTINGs
> 
> I don't know how this relates to CMA and I don't know what target
> multipliers you mean.

Now let's consider evaluating impact of a Cathedral.  The algorithm number
2 above will not give us anything useful (unless the whole city changes
it's happiness status).  Why?  Because the prime purpose of the Cathedral
is to allow us to send Elvises to work in the field (Cultural Revolution
sort of thing).  And that requires a bit more consideration than
refresh_city.  How would the freed workers be put?  What are our
production targets?  This is the knowledge that CMA possesses.  So instead
of refresh_city above, you would call cma_refresh_city for
happiness-related buildings.

As for "target multipliers", how do you call those coefficients that you 
set in CMA?

G.