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annotate scripts/specfun/pow2.m @ 14383:07c55bceca23 stable

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Fix guarded_eval() subfunction in fminunc (bug #35534). * fminunc.m: Fix guarded_eval() subfunction in fminunc (bug #35534).
author Olaf Till <olaf.till@uni-jena.de>
date Wed, 15 Feb 2012 14:44:37 +0100
parents 72c96de7a403
children f3d52523cde1
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72c96de7a403 maint: update copyright notices for 2012
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1 ## Copyright (C) 1995-2012 Kurt Hornik
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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 {Mapping Function} {} pow2 (@var{x})
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21 ## @deftypefnx {Mapping Function} {} pow2 (@var{f}, @var{e})
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22 ## With one argument, computes
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23 ## @tex
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24 ## $2^x$
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25 ## @end tex
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26 ## @ifnottex
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27 ## 2 .^ x
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28 ## @end ifnottex
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29 ## for each element of @var{x}.
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30 ##
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31 ## With two arguments, returns
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32 ## @tex
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33 ## $f \cdot 2^e$.
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34 ## @end tex
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35 ## @ifnottex
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36 ## f .* (2 .^ e).
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37 ## @end ifnottex
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38 ## @seealso{log2, nextpow2}
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39 ## @end deftypefn
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41 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at>
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42 ## Created: 17 October 1994
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43 ## Adapted-By: jwe
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45 function y = pow2 (f, e)
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46
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47 if (nargin == 1)
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48 y = 2 .^ f;
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49 elseif (nargin == 2)
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50 y = f .* (2 .^ e);
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51 else
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52 print_usage ();
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53 endif
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54
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55 endfunction
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57 %!test
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58 %! x = [3, 0, -3];
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59 %! v = [8, 1, .125];
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60 %! assert(all (abs (pow2 (x) - v) < sqrt (eps)));
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61
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62 %!test
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63 %! x = [3, 0, -3, 4, 0, -4, 5, 0, -5];
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64 %! y = [-2, -2, -2, 1, 1, 1, 3, 3, 3];
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65 %! z = x .* (2 .^ y);
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66 %! assert(all (abs (pow2 (x,y) - z) < sqrt (eps)));
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68 %!error pow2();
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69