1:45 p.m.
Just wondering if anyone has made a big investment in writing
user-defined functions for gretl, using the apparatus that was
first provided in gretl version 1.3.0.
The reason I ask is that I'm considering making a
backward-incompatible change in the way user-defined functions work
in the next gretl release. Jack Lucchetti and I have been testing a
new type of function which provides for a more structured
programming style in gretl scripts. The new definition of functions
should make it easier for experts to make specialized functions
available for use in other people's scripts.
I'm attaching a short description of new-style functions.
--
Allin Cottrell
Department of Economics
Wake Forest University, NC
3:45 p.m.
Allin,
I was playing with the square() function in the list context. It would be
very useful if one could specify the equivalent of the --cross option in
the function, as in
list foo = x1 x2 x3
list foosq = square(foo,1) # x-products
as opposed to
list foo = x1 x2 x3
list foosq = square(foo,0) # no x-products
I've been trying to find the place in the source where to make some
changes, but I gave up after the umpteenth Alt-.
Any advice?
Riccardo `Jack' Lucchetti
Dipartimento di Economia
Università di Ancona
jack(a)dea.unian.it
http://www.econ.unian.it/lucchetti
3:26 a.m.
On Thu, 16 Jun 2005, jack wrote:
I was playing with the square() function in the list context. It
would be very useful if one could specify the equivalent of the
--cross option in the function, as in
list foo = x1 x2 x3
list foosq = square(foo,1) # x-products
This is added in CVS now. It's a _very_ fiddly parse, and to work
the command must contain no spaces:
OK: list foosq = square(foo,1)
Bad: list foosq = square(foo, 1)
The trouble is that the command-line parser in interact.c is
oriented to space-separated fields, so the second form above will
seem like
list foosq = square(foo,
plus an extraneous "1)".
Perhaps I can think of another way of approaching this...
Allin.
3:12 p.m.
New subject: User-defined functions in gretl (2)
On Thu, 16 Jun 2005, jack wrote:
I was playing with the square() function in the list context. It
would be
very useful if one could specify the equivalent of the --cross option in
the function, as in
list foo = x1 x2 x3
list foosq = square(foo,1) # x-products
Please disregard my last posting on this topic. Here's a better
solution, now in CVS:
list foosq = square(foo) # just squares
list foox = cross(foo) # includes x-products
Allin Cottrell
3:23 p.m.
New subject: User-defined functions in gretl (2)
On Fri, 17 Jun 2005, Allin Cottrell wrote:
On Thu, 16 Jun 2005, jack wrote:
> I was playing with the square() function in the list context. It would be
> very useful if one could specify the equivalent of the --cross option in
> the function, as in
>
> list foo = x1 x2 x3
> list foosq = square(foo,1) # x-products
Please disregard my last posting on this topic. Here's a better
solution, now in CVS:
list foosq = square(foo) # just squares
list foox = cross(foo) # includes x-products
Ahhh, that's better....
Riccardo `Jack' Lucchetti
Dipartimento di Economia
Università di Ancona
jack(a)dea.unian.it
http://www.econ.unian.it/lucchetti
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