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annotate scripts/specfun/realpow.m @ 11587:c792872f8942

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all script files: untabify and strip trailing whitespace
author John W. Eaton <jwe@octave.org>
date Thu, 20 Jan 2011 17:35:29 -0500
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1 ## Copyright (C) 2008-2011 David Bateman
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2 ##
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3 ## This file is part of Octave.
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4 ##
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5 ## Octave is free software; you can redistribute it and/or modify it
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6 ## under the terms of the GNU General Public License as published by
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7 ## the Free Software Foundation; either version 3 of the License, or (at
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8 ## your option) any later version.
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9 ##
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10 ## Octave is distributed in the hope that it will be useful, but
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 ## General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public License
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16 ## along with Octave; see the file COPYING. If not, see
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17 ## <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @deftypefn {Function File} {} realpow (@var{x}, @var{y})
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21 ## Compute the real-valued, element-by-element power operator. This is
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22 ## equivalent to @w{@code{@var{x} .^ @var{y}}}, except that @code{realpow}
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23 ## reports an error if any return value is complex.
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24 ## @seealso{reallog, realsqrt}
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25 ## @end deftypefn
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26
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27 function z = realpow (x, y)
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28 if (nargin != 2)
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29 print_usage ();
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30 else
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31 z = x .^ y;
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32 if (iscomplex (z))
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33 error ("realpow: produced complex result");
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34 endif
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35 endif
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36 endfunction
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37
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38 %!assert (power (1:10, 0.5:0.5:5), realpow (1:10, 0.5:0.5:5))
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39 %!assert ([1:10] .^ [0.5:0.5:5], realpow (1:10, 0.5:0.5:5))
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40 %!test
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41 %! x = rand (10,10);
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42 %! y = randn (10,10);
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43 %! assert (x.^y,realpow(x,y))
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44 %!assert (realpow(1i,2),-1)
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45 %!error (realpow(-1, 1/2))