public static Expr TryEvaluate(Expr expr, Dictionary <string, Expr> symbols)
{
IEnumerable <Expr> vars = expr.CollectVariables();
bool canReduce = true;
for (int i = 0; canReduce && vars.Any(); i++)
{
if (i > symbols.Count)
{
throw new EvaluationException("Infinite cycle detected.");
}
canReduce = false;
foreach (Expr v in vars)
{
string varStr = v.VariableName;
if (symbols.ContainsKey(varStr))
{
expr = expr.Substitute(v, symbols[varStr]);
canReduce = true;
}
}
vars = expr.CollectVariables();
}
if (expr.Type == SymbolicExpressionType.Undefined)
{
throw new EvaluationException("Undefined variable found in expression");
}
return(expr);
}
//Возвращает наименования переменных в данном ОДУ public IEnumerable <Expr> GetVariables() => function.CollectVariables();