public static IEquationSolutions Solve(Equation equation, string variable)
{
EquationClassifier.Classify(equation, variable);
var sols = Solve(variable, equation.Left, equation.Classification);
var newSols = new EquationSolutions();
RecursiveSolve(variable, sols, newSols);
return(newSols);
}
public void Linear_Variables_3()
{
//Arrange
var text = "y*y*x - 4*y + 5";
var expression = ExpressionBuilder.BuildFlat(RPNParser.Parse(text).Output).Execute();
var equation = new Equation(text, expression, null);
//Act
var sut = EquationClassifier.Classify(equation, "x");
//Assert
Assert.AreEqual(EquationTypes.Linear, sut.Classification.EquationType);
}
public void Linear_NumbersOnly_Contract()
{
//Arrange
var text = "2*x^2 + 3*x - 2*x^2";
var expression = ExpressionBuilder.BuildFlat(RPNParser.Parse(text).Output).Execute();
var equation = new Equation(text, expression, null);
//Act
var sut = EquationClassifier.Classify(equation, "x");
//Assert
Assert.AreEqual(EquationTypes.Linear, sut.Classification.EquationType);
}
public void Quadratic_NumbersOnly()
{
//Arrange
//-2*x^2 + 5*x - 1
var text = "2*x + 2*x^2 - 2 + 3*x - 4*x^2 + 1";
var expression = ExpressionBuilder.BuildFlat(RPNParser.Parse(text).Output).Execute();
var equation = new Equation(text, expression, null);
//Act
var sut = EquationClassifier.Classify(equation, "x");
//Assert
Assert.AreEqual(EquationTypes.Quadratic, sut.Classification.EquationType);
}
private static void RecursiveSolve(string variable, IEquationSolutions sols, IEquationSolutions newSols)
{
var keys = sols.Solutions.Keys.ToList();
foreach (var k in keys)
{
if (k != variable)
{
var s = sols.Solutions[k];
foreach (var e in s.Item2)
{
var tmpEq = new FlatAddExpression();
tmpEq.Add(s.Item1);
tmpEq.Add(new UnaryExpression(Enums.Operators.OperatorTypes.Sign, e));
var emp = tmpEq.Execute();
var c = EquationClassifier.Classify(emp, variable);
var tmp = Solve(variable, tmpEq, c);
foreach (var ns in tmp.Solutions)
{
RecursiveSolve(variable, tmp, newSols);
}
}
}
else
{
var s = sols.Solutions[k];
if (!newSols.Solutions.ContainsKey(variable))
{
newSols.Solutions.Add(variable, new Tuple <IExpression, List <IExpression> >(s.Item1, new List <IExpression>()));
}
newSols.Solutions[variable].Item2.AddRange(s.Item2);
}
}
}
