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## Copyright (C) 2008-2013 David Bateman
##
## This file is part of Octave.
##
## Octave 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 of the License, or (at
## your option) any later version.
##
## Octave 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 Octave; see the file COPYING. If not, see
## <http://www.gnu.org/licenses/>.
## -*- texinfo -*-
## @deftypefn {Function File} {} realpow (@var{x}, @var{y})
## Compute the real-valued, element-by-element power operator. This is
## equivalent to @w{@code{@var{x} .^ @var{y}}}, except that @code{realpow}
## reports an error if any return value is complex.
## @seealso{reallog, realsqrt}
## @end deftypefn
function z = realpow (x, y)
if (nargin != 2)
print_usage ();
else
z = x .^ y;
if (iscomplex (z))
error ("realpow: produced complex result");
endif
endif
endfunction
%!assert (power (1:10, 0.5:0.5:5), realpow (1:10, 0.5:0.5:5))
%!assert ([1:10] .^ [0.5:0.5:5], realpow (1:10, 0.5:0.5:5))
%!test
%! x = rand (10,10);
%! y = randn (10,10);
%! assert (x.^y, realpow (x,y));
%!assert (realpow (1i,2), -1)
%!error <produced complex result> realpow (-1, 1/2)
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