/usr/share/octave/packages/linear-algebra-2.2.0/@kronprod/times.m is in octave-linear-algebra 2.2.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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##
## 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} times (@var{KP})
## XXX: Write documentation
## @end deftypefn
function retval = times (M1, M2)
## Check input
if (nargin == 0)
print_usage ();
elseif (nargin == 1)
## This seems to be what happens for full and sparse matrices, so we copy this behaviour
retval = M1;
return;
endif
if (!ismatrix (M1) || !ismatrix (M2))
error ("times: input arguments must be matrices");
endif
if (!size_equal (M1, M2))
error ("times: nonconformant arguments (op1 is %dx%d, op2 is %dx%d)",
rows (M1), columns (M1), rows (M2), columns (M2));
endif
## Take action depending on input types
M1_is_KP = isa (M1, "kronprod");
M2_is_KP = isa (M2, "kronprod");
## Product of Kronecker Products
## Check if the size match such that the result is a Kronecker Product
if (M1_is_KP && M2_is_KP && size_equal (M1.A, M2.A) && size_equal (M1.B, M2.B))
retval = kronprod (M1.A .* M2.A, M1.B .* M2.B);
elseif (isscalar (M1) || isscalar (M2)) # Product of Kronecker Product and scalar
retval = M1 * M2; ## Forward to mtimes.
else # All other cases.
## Form the full matrix or sparse matrix of both matrices
## XXX: Can we do something smarter here?
if (issparse (M1))
M1 = sparse (M1);
else
M1 = full (M1);
endif
if (issparse (M2))
M2 = sparse (M2);
else
M2 = full (M2);
endif
retval = M1 .* M2;
endif
endfunction
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