public PSymbol this[PSymbol value]
{
get
{
PSymbol ret = new PSymbol("sin(" + value.Expression + ")");
return(ret);
}
}
public PSymbol this[string variable]
{
get
{
PSymbol ret = new PSymbol(variable);
Variables.Add(variable); ret.Variable = variable;
ret.parent = this;
return(ret);
}
}
public static PSymbol DF(PSymbol psym)
{
PSymbol ret = null;
TokenFactory tf = new TokenFactory();
tf.ParseExpression(psym.Expression);
foreach (Symbol sym in tf.symbolList)
{
}
return(ret);
}
public static PSymbol operator ^(PSymbol a, PSymbol b)
{
SetParent(a, b);
PSymbol ret = new PSymbol(a.Expression + "^" + b.Expression);
if (a.Expression.IndexOf(" + ") != -1)
{
ret = new PSymbol("(" + a.Expression + ")^" + b.Expression);
}
ret.parent = a.parent;
ret.lstSymbols.Add(a);
ret.lstSymbols.Add(b);
return(ret);
}
public static int Test_SymbolStuff()
{
PSymbolFactory pf = new PSymbolFactory();
PSymbol x = pf["x"];
PSymbol y = pf["y"];
Sin sin = new Sin();
PSymbol r = 2 * x ^ 2 * sin[x];
//PSymbol r2 = r^3;
Console.WriteLine("{0}", DerivativeStatePattern.DF(r));
return(0);
}
private static void SetId(PSymbol sym)
{
long id = 1;
if (lstIds.Count == 0)
{
lstIds.Add(1);
}
else
{
id = lstIds[lstIds.Count - 1] + 1;
lstIds.Add(id);
}
sym.PSymbolId = id;
htSymbols[id] = sym;
}
public static PSymbol operator /(PSymbol a, PSymbol b)
{
PSymbol ret = null;
SetParent(a, b);
if (a.Expression == b.Expression)
{
ret = new PSymbol("1");
}
else
{
ret = new PSymbol(a.Expression + "/" + b.Expression);
}
ret.parent = a.parent;
ret.lstSymbols.Add(a);
ret.lstSymbols.Add(b);
return(ret);
}
private static void SetParent(PSymbol a, PSymbol b)
{
if (a.parent != null && b.parent != null)
{
return;
}
if (a.parent == null && b.parent == null)
{
a.parent = b.parent = new PSymbolFactory();
}
else if (a.parent != null && b.parent == null)
{
b.parent = a.parent;
}
else if (b.parent != null && a.parent == null)
{
a.parent = b.parent;
}
}
public static PSymbol SymbolToPSymbol(Symbol sym)
{
PSymbol ret = new PSymbol();
for (int i = 0; i < sym.Tokens.Count; i++)
{
Token t = sym.Tokens[i];
if (t.Type == "Literal")
{
ret += new PSymbol(Rational.Parse(t.Value));
}
else if (t.Type == "Variable")
{
if (i > 0 && sym.Tokens[i - 1].Type == "Literal")
{
}
}
}
return(ret);
}
public static string DF(PSymbol psym)
{
string exp = psym.Expression.Replace("*", "");
return(DF(new Symbol(exp), true));
}