[GiNaC-list] Given a formal iterated derivative (GiNaC::fderivative), what actually is it?
ricardo.buring at gmail.com
Thu Apr 14 12:45:13 CEST 2016
Dear Richard, Vladimir,
Thanks for discussing this.
On Thu, Apr 14, 2016 at 12:04 AM, Richard B. Kreckel <kreckel at in.terlu.de>
> Patch suggestion attached. Will commit soon if no objection is raised.
> All my best,
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.)
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