protected override Expression TransformFunction(FunctionExpression functionExpression)
{
if (functionExpression.Function == Operators.Diff)
{
VariableListExtractor extractor = new VariableListExtractor();
extractor.Visit(functionExpression[1]);
IReadOnlyList <Variable> variables = extractor.Variables;
if (variables.Count == 0)
{
throw new InvalidOperationException("Cannot calculate derivative by constant");
}
throw new NotImplementedException();
}
if (functionExpression.Function == Operators.Plus)
{
return(Transform(functionExpression[0]));
}
if (functionExpression.Function is Operator)
{
SumAggregator aggregator = new SumAggregator();
aggregator.VisitFunction(functionExpression);
return(aggregator.ToExpression());
}
return(functionExpression.Function.Apply(functionExpression.Select(Transform)));
}
