public override Expression SymbolicDiff(Variable var)
{
if (DefiningExpression != null)
{
if (_incidence == null)
{
Incidence();
}
if (_incidence.Contains(var))
{
// var dxdy = new Variable("d" + Name + "d" + var.Name, 1);
//dxdy.BindTo(DefiningExpression.Diff(var));
//return dxdy;
return(DefiningExpression.SymbolicDiff(var));
}
else
{
return(0);
}
}
return(new IntegerLiteral {
Value = this == var ? 1 : 0
});
}
public override HashSet <Variable> Incidence()
{
if (DefiningExpression != null)
{
if (_incidence == null)
{
_incidence = DefiningExpression.Incidence();
}
return(_incidence);
}
return(new HashSet <Variable> {
this
});
}
public override double Diff(Evaluator evaluator, Variable var)
{
if (DefiningExpression != null)
{
if (_incidence == null)
{
Incidence();
}
if (_incidence.Contains(var))
{
return(DefiningExpression.Diff(evaluator, var));
}
else
{
return(0);
}
}
return(this == var ? 1 : 0);
}
public override double Eval(Evaluator evaluator)
{
if (DefiningExpression != null)
{
ValueInSI = DefiningExpression.Eval(evaluator);
if (Double.IsNaN(ValueInSI))
{
ValueInSI = 0;
}
if (ValueInSI > UpperBound)
{
ValueInSI = UpperBound;
}
if (ValueInSI < LowerBound)
{
ValueInSI = LowerBound;
}
// ValueInSI = Math.Max(Math.Min(ValueInSI, UpperBound), LowerBound);
}
return(ValueInSI);
}
