Re: [Gretl-users] error with null list

On Thu, January 4, 2007 12:00, Sven Schreiber wrote: [snip] Ok, I see what you mean now. If I'm not mistaken, your idea is to use the include statement to bring back into gretl some objects (presumably matrices), previously generated outside by a python script. Allin and I had started thinking about a similar mechanism some months ago: the only difference was that I had thought of using Ox instead of python. I even managed to write a working prototype of an exchange mechanism that worked as follows. First, let's define the concept of a "binary bundle". A binary bundle is a binary file which contains one or more objects. An object can be 1) a scalar 2) a matrix 3) a dataset 4) a model Now, everything that's needed to shuffle stuff to/from gretl is the ability, by gretl and the helper application (Ox, python, R, scilab, whatever) to read and write bundles. I had come to the point of writing an Ox class for this, and the corresponding C functions, which we never merged into gretl. But if you think that you can write a corresponding set of functions in python, then we wouldn't need to mess with run/include. For example, you may do --- * gretl side * --- series x = log(z) bundle_write(x, "/tmp/foo.gbb") ols y 0 x matrix V = $vcv bundle_write(V, "/tmp/foo.gbb") ! ... your external command here ... matrix beta = bundle_read("b", "/tmp/bar.gbb") --- * helper app side (pseudocode vaguely reminiscent of R) * --- x <- bundle.read(x, "/tmp/foo.gbb") v <- bundle.read(V, "/tmp/foo.gbb") /* do stuff */ bundle.write(b, "/tmp/bar.gbb") I think this would provide a very neat way to do what I assume you need. However, the coding effort is definitely not trivial. Could we schedule this for 1.7.0? Riccardo (Jack) Lucchetti Dipartimento di Economia Facoltà di Economia "G. Fuà" Ancona