private static Function _mul(FunctionElement e1, FunctionElement e2)
{
return e1.ToVariableMultiplication() * e2;
}
private static Function _mul(FunctionElement e, double d)
{
return e.ToVariableMultiplication() * d;
}
public VariablesMulriplication AddVariable(FunctionElement variable)
{
if (this.HasVariable(variable.Name))
{
var v = this.GetVariableByName(variable.Name);
if (variable.MathFunctions.Count == 0 && v.MathFunctions.Count == 0)
{
// x * x
v.ApplyFunction("power", new Function(2));
}
else
{
if (variable.MathFunctions.Count == 1 && variable.MathFunctions.Last() == Function.GetMathFunction("power") &&
v.MathFunctions.Count == 1 && v.MathFunctions.Last() == Function.GetMathFunction("power"))
{
// sum powers
v.MathFunctions[0] = new Tuple<MathFunctions.IMathFunction, FunctionElement[]>(Function.GetMathFunction("power"),
new FunctionElement[] { v.MathFunctions[0].Item2[0] + variable.MathFunctions[0].Item2[0] });
}
else
{
if (variable.MathFunctions.Count == 0 && v.MathFunctions.Count == 1 && v.MathFunctions[0] == Function.GetMathFunction("power"))
{
variable.ApplyFunction("power", v.MathFunctions[0].Item2[0] + 1);
}
else
{
if (v.MathFunctions.Count == 0 && variable.MathFunctions.Count == 1 && variable.MathFunctions[0] == Function.GetMathFunction("power"))
{
variable.MathFunctions[0] = new Tuple<MathFunctions.IMathFunction, FunctionElement[]>(Function.GetMathFunction("power"),
new FunctionElement[] { variable.MathFunctions[0].Item2[0] + 1 });
}
else
{
this.variables.Add(variable);
}
}
}
}
}
else
{
if (variable.IsDouble())
{
if (this.variables.Count == 0)
{
this.variables.Add(new Variable(""));
}
this.Constant *= variable.ToDouble();
}
else
{
if (variable is Function && variable.IsVariableMultiplication())
{
var temp = variable.ToVariableMultiplication();
temp.variables.ForEach(v => this.AddVariable(v));
this.Constant *= temp.Constant;
}
else
{
this.variables.Add(variable);
}
}
}
return this;
}
