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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} {} realsqrt (@var{x})
## Return the real-valued square root of each element of @var{x}. Report an
## error if any element results in a complex return value.
## @seealso{sqrt, realpow, reallog}
## @end deftypefn
function y = realsqrt (x)
if (nargin != 1)
print_usage ();
elseif (iscomplex (x) || any (x(:) < 0))
error ("realsqrt: produced complex result");
else
y = sqrt (x);
endif
endfunction
%!assert (sqrt (1:5), realsqrt (1:5))
%!test
%! x = rand (10,10);
%! assert (sqrt (x), realsqrt (x));
%!error <produced complex result> realsqrt (-1)
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