void SimplexDecisionProcedure::shrinkInfeasFunc(TimerStat& timer, ArithVar inf, const ArithVarVec& dropped){
TimerStat::CodeTimer codeTimer(timer);
for(ArithVarVec::const_iterator i=dropped.begin(), i_end = dropped.end(); i != i_end; ++i){
ArithVar back = *i;
int focusSgn = d_errorSet.focusSgn(back);
Rational chg(-focusSgn);
d_linEq.substitutePlusTimesConstant(inf, back, chg);
}
}
ArithVar SimplexDecisionProcedure::constructInfeasiblityFunction(TimerStat& timer, const ArithVarVec& set){
Debug("constructInfeasiblityFunction") << "constructInfeasiblityFunction start" << endl;
TimerStat::CodeTimer codeTimer(timer);
Assert(!d_errorSet.focusEmpty());
Assert(debugIsASet(set));
ArithVar inf = requestVariable();
Assert(inf != ARITHVAR_SENTINEL);
std::vector<Rational> coeffs;
std::vector<ArithVar> variables;
for(ArithVarVec::const_iterator iter = set.begin(), iend = set.end(); iter != iend; ++iter){
ArithVar e = *iter;
Assert(d_tableau.isBasic(e));
Assert(!d_variables.assignmentIsConsistent(e));
int sgn = d_errorSet.getSgn(e);
Assert(sgn == -1 || sgn == 1);
const Rational& violatedCoeff = sgn < 0 ? d_negOne : d_posOne;
coeffs.push_back(violatedCoeff);
variables.push_back(e);
Debug("constructInfeasiblityFunction") << violatedCoeff << " " << e << endl;
}
d_tableau.addRow(inf, coeffs, variables);
DeltaRational newAssignment = d_linEq.computeRowValue(inf, false);
d_variables.setAssignment(inf, newAssignment);
//d_linEq.trackVariable(inf);
d_linEq.trackRowIndex(d_tableau.basicToRowIndex(inf));
Debug("constructInfeasiblityFunction") << inf << " " << newAssignment << endl;
Debug("constructInfeasiblityFunction") << "constructInfeasiblityFunction done" << endl;
return inf;
}