On Tue, 30 Jan 2007, Sven Schreiber wrote:
Riccardo (Jack) Lucchetti schrieb:
> ps Sven, Allin and I have been adding quite a few matrix functions
> lately. I have the feeling that at least some of your python programs
> (excellent style, by the way) could be written directly in CVS gretl now.
> Do you feel like giving it a try?
Well in terms of matrix functions there wasn't really anything missing IIRC.
But what are those things you guys added?
We added a couple of functions lately, namely
which gives the right null space for matrix X, and
svd(X, &U, &V)
which returns the singular values of X as a vector, and provides
the left singular vectors of X (in U, if non-null) and/or the
(transpose of) the right singular values (in V, if non-null).
We've also fixed up ".^" (element-wise exponentiation) so that it
works in the same flexible way as ".*", and have added operators
".+", ".-" and ".=" that work in the same way.
I'm probably forgetting some other things...
On a slightly different track, there are also the functions
BFGSmax() and fdjac() (User's Guide, section 5.8).
Apart from that I'm a bit hesitant because porting to gretl
script means abandoning object-orientation. So the structure
would be quite different, and therefore maintenance effort of
the parallel python and gretl programs would be a bit annoying.
Sorry, I haven't had time to take a close look at your py4gretl
code yet; I might have some suggestion to make after doing that.