/usr/share/octave/packages/linear-algebra-2.2.0/@kronprod/plus.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 48 49 50 51 52 53 54 55 56 | ## 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} plus (@var{a}, @var{a})
## Return the sum of a Kronecker product and another matrix. This is performed
## by forming the full matrix of both inputs and is as such a potential expensive
## operation.
## @seealso{plus, @@kronprod/minus}
## @end deftypefn
function retval = plus (M1, M2)
if (nargin == 0 || nargin > 2)
print_usage ();
elseif (nargin == 1)
## This seems to be the behaviour for the built-in types so we copy that
retval = M1;
return;
endif
if (!ismatrix (M1) || !ismatrix (M2))
error ("plus: input arguments must be matrics");
endif
if (!size_equal (M1, M2))
error ("plus: nonconformant arguments (op1 is %dx%d, op2 is %dx%d)",
rows (M1), columns (M1), rows (M2), columns (M2));
endif
## 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;
endfunction
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