[Gretl-devel] Re: hdprod() extension
On Mon, 25 Jan 2021, Riccardo (Jack) Lucchetti wrote:
On Mon, 25 Jan 2021, Sven Schreiber wrote:
> Sounds good to me. Does this operation have a name in algebra?
To the best of my knowledge, it's a variant of the Khatri-Rao product (as
mentioned in the help files). I've just learned that Wikipedia also calls it
the "face-splitting" product.
OK; I just pushed to git the modifications needed to gretl_matrix.c to
handle the case when B is NULL. Seems to work ok. However, this is not
user-visible yet because I'm not sure of how to handle a hansl function
whose signature would be the one I proposed, that is: two matrix
arguments, with the second one optional.
Allin: I mucked about a little with geneval.c, but I was afraid I was
mishandling things, so I'd rather wait for a hint from you. Thanks!
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Riccardo (Jack) Lucchetti
Dipartimento di Scienze Economiche e Sociali (DiSES)
Università Politecnica delle Marche
(formerly known as Università di Ancona)
r.lucchetti(a)univpm.it
http://www2.econ.univpm.it/servizi/hpp/lucchetti
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