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Slightly modified the formula: the worst individual had "fitness" 0 in hte case of linear scaling with pressure=2. Now it has fitness 1/[P(P-1)/2]

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Thanks to Gilles BAUDRILLARD (EADS)
This commit is contained in:
evomarc 2003-09-02 05:49:37 +00:00
commit 45a2d08432
1 changed files with 2 additions and 2 deletions
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4
eo/src/eoRanking.h
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@ -81,7 +81,7 @@ public:
for (unsigned i=0; i<pSize; i++)
{
int which = lookfor(rank[i], _pop);
value()[which] = alpha*(pSizeMinusOne-i)+beta;
value()[which] = alpha*(pSize-i)+beta; // worst -> 1/[P(P-1)/2]
}
}
else // exponent != 1
@ -91,7 +91,7 @@ public:
{
int which = lookfor(rank[i], _pop);
// value in in [0,1]
double tmp = ((double)(pSizeMinusOne-i))/pSizeMinusOne;
double tmp = ((double)(pSize-i))/pSize;
// to the exponent, and back to [m,M]
value()[which] = gamma*pow(tmp, exponent)+beta;
}