/usr/share/octave/packages/linear-algebra-2.2.0/@kronprod/kronprod.m is in octave-linear-algebra 2.2.0-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 | ## Copyright (C) 2010 Soren Hauberg
##
## This program is free software; you can redistribute it and/or modify
## it under the terms of the GNU General Public License as published by
## the Free Software Foundation; either version 3, or (at your option)
## any later version.
##
## This program is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with this file. If not, see <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} kronprod (@var{A}, @var{B})
## @deftypefnx{Function File} kronprod (@var{A}, @var{B}, @var{P})
## Construct a Kronecker product object.
## XXX: Write proper documentation
##
## With two input arguments, the following matrix is represented: kron (A, B);
##
## With three input arguments, the following matrix is represented: P * kron (A, B) * P'
## (P must be a permutation matrix)
##
## @end deftypefn
function retval = kronprod (A, B, P)
if (nargin == 0)
KP.A = KP.B = KP.P = [];
elseif (nargin == 2 && ismatrix (A) && ismatrix (B))
KP.A = A;
KP.B = B;
KP.P = [];
elseif (nargin == 3 && ismatrix (A) && ismatrix (B))
# && strcmp (typeinfo (P), "permutation matrix"))
## XXX: Check that the size of P is correct
KP.A = A;
KP.B = B;
KP.P = P;
else
print_usage ();
endif
retval = class (KP, "kronprod");
endfunction
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