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Added eoRandomReduce

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evomarc 2001-01-26 04:06:09 +00:00
commit ce031f10a3
1 changed files with 16 additions and 0 deletions
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16
eo/src/eoReduce.h
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@ -60,6 +60,22 @@ template <class EOT> class eoTruncate : public eoReduce<EOT>
}
};
/** random truncation */
template <class EOT> class eoRandomReduce : public eoReduce<EOT>
{
void operator()(eoPop<EOT>& _newgen, unsigned _newsize)
{
if (_newgen.size() == _newsize)
return;
if (_newgen.size() < _newsize)
throw std::logic_error("eoRandomReduce: Cannot truncate to a larger size!\n");
// shuffle the population, then trucate
_newgen.shuffle();
_newgen.resize(_newsize);
}
};
/**
EP truncation method (some global stochastic tournament + sort)
Softer selective pressure than pure truncate