From octave-maintainers-request at bevo dot che dot wisc dot edu  Sat Oct 23 13:21:36 1999
Subject: Unidentified subject!
From: "John W. Eaton" <jwe at bevo dot che dot wisc dot edu>
To: etienne at isr dot isr dot ist dot utl dot pt
Cc: octave-maintainers at bevo dot che dot wisc dot edu, etienne@isr.ist.utl.pt
Date: Sat, 23 Oct 1999 13:20:10 -0500 (CDT)

On 23-Oct-1999, etienne grossmann <etienne at anonimo dot isr dot ist dot utl dot pt> wrote:

|   Since yesterday, I have written a "src/DLD-FUNCTIONS/kron.cc" that
| implements the Kronecker product for real and complex matrices.
| 
|   I also wrote two test scripts "test/octave.test/linalg/kron-1.m" and
| "test/octave.test/linalg/kron-2.m" and modified src/Makefile.in and
| test/octave.test/linalg/linalg.exp, the later so that "make check"
| checks the new function too.
| 
|   May I send a patch? To octave-source?

Sure.

BTW, a better way to implement this might be to put the code for the
real and complex versions of kron in liboctave, then make your DLD
function a simple wrapper.  That way, the code would be useful from
other C++ code, not just from the Octave interpreter.  In other words,
people who already have Matrix objects would not have to do stuff like
this to use the new code:

  octave_value_list tmp_args;
  tmp_args(1) = b_mat;
  tmp_args(0) = a_mat;
  octave_value_list kron_result = feval ("kron", tmp_args);
  Matrix result = kron_result(0);

Instead, they could just use

  Matrix result = kron (a_mat, b_mat);

Wouldn't that be better?

| ps : Silly question : how does one do a nice patch when not only are
|      files modified, but also created? 

Use -N.

jwe