[GiNaC-list] Given a formal iterated derivative (GiNaC::fderivative), what actually is it?

[Ricardo Buring]

Dear Richard, Vladimir,

Thanks for discussing this.

On Thu, Apr 14, 2016 at 12:04 AM, Richard B. Kreckel <kreckel at 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
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