[Cs5500] tiny amount

[Ahmed Abdelmeged]

Numerical instability in ProtocolInterpreter. Should be an easy exercise.

    protected void updateReputation(int playerNum, double result) {
        if(updateReputationsOnlyWhenBobLoses && playerNum != 1) return;
        RemotePlayerProxy player1 = players[playerNum];
        RemotePlayerProxy player2 = players[1 - playerNum];
        double player1InitialReputation = player1.getReputation();
        double player2InitialReputation = player2.getReputation();
        players[playerNum].setReputation(players[playerNum].getReputation()
+ claim.getConfidence() * result);
        players[1 - playerNum].setReputation(players[1 -
playerNum].getReputation() - claim.getConfidence() * result);
        double player1FinalReputation = player1.getReputation();
        double player2FinalReputation = player2.getReputation();
        if(player1FinalReputation - player1InitialReputation >= 0){
            winner = player1.getName();
            pointsWon = player1FinalReputation - player1InitialReputation;
        }else{
            winner = player2.getName();
            pointsWon = player2FinalReputation - player2InitialReputation;
        }
    }


On Fri, Dec 2, 2011 at 1:20 PM, Karl Lieberherr <lieber at ccs.neu.edu> wrote:

> Hi Ahmed:
>
> How is it possible that the winner wins only a tiny amount with refuting:
>
> claim mmg.MMGInstanceSet {{      }} scg.protocol.ForAllExistsMax {{
> }} 0.6180339887498949 1.0
> proposer  {{ TheGreatGonzo }}
> opposer  {{ danset }}
> action refuting
> responses provider  {{ danset }}  pr provide mmg.MMGInstance {{
> 0.5849833561100104  }}
> provider  {{ TheGreatGonzo }}  pr solve mmg.MMGSolution {{
> 0.7047709588046943  }}
>   winner  {{ TheGreatGonzo }}
> pointsWon 1.000017846308765E-10
>
> -- Karl
>
>


-- 
Ahmed
-------------- next part --------------
HTML attachment scrubbed and removed