Dear Richard, Vladimir, Thanks for discussing this. On Thu, Apr 14, 2016 at 12:04 AM, Richard B. Kreckel <kreckel@in.terlu.de> wrote:
Patch suggestion attached. Will commit soon if no objection is raised.
All my best, -richard.
This patch suggestion looks fine to me, save for some semantics: in English the verb is differentiate rather than derive, though in Dutch and some other languages the words are identical. The method could also be called derivatives() or derivative_indices(), or just indices(). Since the parameter_set is actually a multi-index, the method could also be called multi_index(). Whatever you decide to call it is fine with me. The reason I brought this up is that I'm constructing some complicated expressions involving (multiple) partial derivatives of a function f, and in the end I would like to obtain the coefficients in front of all the different derivatives of f. (This can easily be implemented after this patch is applied.) Best regards, Ricardo