void BackTrack::prune (unsigned level)
// Indicates that the combination of values associated with
// variables 0 .. level-1 (inclusive) has been judged unacceptable
// (regardless of the values that could be given to variables
// level..numberOfVariables()-1. The backtracking state will advance
// to the next solution in which at least one of the values in the
// variables 0..level-1 will have changed.
{
level = (level > numberOfVariables()) ? numberOfVariables() : level;
fill (values.begin()+level, values.end(), 0);
// Treat the top level-1 values as a level-1 digit number. Add one
// to the rightmost "digit". If this digit goes too high, reset it to
// zero and "carry one to the left".
int k = level-1;
bool carry = true;
while (k >= 0 && carry)
{
values[k] += 1;
if (values[k] >= arities[k])
values[k] = 0;
else
carry = false;
--k;
}
done = carry;
}
BackTrack BackTrack::operator++(int)
// Same as other operator++, but returns a copy of the old backtrack state
{
BackTrack oldValue = *this;
prune(numberOfVariables());
return oldValue;
}
BackTrack& BackTrack::operator++()
// Indicates that the combination of values associated with
// variables 0 .. nVariables-1 (inclusive) has been judged unacceptable.
// The backtracking state will advance
// to the next solution in which at least one of the values in the
// variables 0..level-1 will have changed.
{
prune(numberOfVariables());
return *this;
}
void proposeStartingPoint(SearchPointType &x) const {
x.resize(numberOfVariables());
for (unsigned int i = 0; i < x.size(); i++) {
x(i) = shark::Rng::uni(MIN_PARAM, MAX_PARAM);
}
}
std::vector<Size> numberOfData() const {
return numberOfVariables();
}