/usr/share/octave/packages/linear-algebra-2.2.0/@kronprod/mpower.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 | ## 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} mpower (@var{KP}, @var{k})
## XXX: Write documentation
## @end deftypefn
function retval = mpower (KP, k)
## Check input
if (nargin != 2)
print_usage ();
endif
if (!ismatrix (KP))
error ("mpower: first input argument must be a matrix");
endif
if (!isscalar (k))
error ("mpower: second input argument must be a scalar");
endif
## Do the actual computation
if (issquare (KP.A) && issquare (KP.B) && k == round (k))
retval = kronprod (KP.A^k, KP.B^k);
elseif (issquare (KP))
## XXX: Can we do something smarter here?
retval = full (KP)^k;
else
error ("for A^b, A must be square");
endif
endfunction
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