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Added a new boolean argument to the ctor of eoBitMutation:

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you can now specify a rate-per-bit that will be normalized by the chromSize
This commit is contained in:
evomarc 2001-04-12 05:29:34 +00:00
commit e3834441fd
1 changed files with 5 additions and 2 deletions
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7
eo/src/ga/eoBitOp.h
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@ -132,7 +132,8 @@ template<class Chrom> class eoBitMutation: public eoMonOp<Chrom>
* (Default) Constructor.
* @param _rate Rate of mutation.
*/
eoBitMutation(const double& _rate = 0.01): rate(_rate) {}
eoBitMutation(const double& _rate = 0.01, bool _normalize=false):
rate(_rate), normalize(_normalize) {}
/// The class name.
virtual string className() const { return "eoBitMutation"; }
@ -143,9 +144,10 @@ template<class Chrom> class eoBitMutation: public eoMonOp<Chrom>
*/
bool operator()(Chrom& chrom)
{
double actualRate = (normalize ? rate/chrom.size() : rate);
bool changed_something = false;
for (unsigned i = 0; i < chrom.size(); i++)
if (eo::rng.flip(rate))
if (eo::rng.flip(actualRate))
{
chrom[i] = !chrom[i];
changed_something = true;
@ -156,6 +158,7 @@ template<class Chrom> class eoBitMutation: public eoMonOp<Chrom>
private:
double rate;
bool normalize; // divide rate by chromSize
};