1 ## Copyright (C) 2008-2012 David Bateman
3 ## This file is part of Octave.
5 ## Octave is free software; you can redistribute it and/or modify it
6 ## under the terms of the GNU General Public License as published by
7 ## the Free Software Foundation; either version 3 of the License, or (at
8 ## your option) any later version.
10 ## Octave is distributed in the hope that it will be useful, but
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 ## General Public License for more details.
15 ## You should have received a copy of the GNU General Public License
16 ## along with Octave; see the file COPYING. If not, see
17 ## <http://www.gnu.org/licenses/>.
20 ## @deftypefn {Function File} {} realpow (@var{x}, @var{y})
21 ## Compute the real-valued, element-by-element power operator. This is
22 ## equivalent to @w{@code{@var{x} .^ @var{y}}}, except that @code{realpow}
23 ## reports an error if any return value is complex.
24 ## @seealso{reallog, realsqrt}
27 function z = realpow (x, y)
33 error ("realpow: produced complex result");
38 %!assert (power (1:10, 0.5:0.5:5), realpow (1:10, 0.5:0.5:5))
39 %!assert ([1:10] .^ [0.5:0.5:5], realpow (1:10, 0.5:0.5:5))
43 %! assert (x.^y,realpow(x,y))
44 %!assert (realpow(1i,2),-1)
45 %!error (realpow(-1, 1/2))