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annotate scripts/specfun/pow2.m @ 8920:eb63fbe60fab
update copyright notices
| author | John W. Eaton <jwe@octave.org> |
|---|---|
| date | Sat, 07 Mar 2009 10:41:27 -0500 |
| parents | 81d6ab3ac93c |
| children | c1fff751b5a8 |
| rev | line source |
|---|---|
| 8920 | 1 ## Copyright (C) 1995, 1996, 1999, 2000, 2002, 2004, 2005, 2006, 2007, |
| 2 ## 2008, 2009 Kurt Hornik | |
| 3426 | 3 ## |
| 3922 | 4 ## This file is part of Octave. |
| 5 ## | |
| 6 ## Octave is free software; you can redistribute it and/or modify it | |
| 7 ## under the terms of the GNU General Public License as published by | |
| 7016 | 8 ## the Free Software Foundation; either version 3 of the License, or (at |
| 9 ## your option) any later version. | |
| 3426 | 10 ## |
| 3922 | 11 ## Octave is distributed in the hope that it will be useful, but |
| 2537 | 12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
| 13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 3426 | 14 ## General Public License for more details. |
| 15 ## | |
| 2537 | 16 ## You should have received a copy of the GNU General Public License |
| 7016 | 17 ## along with Octave; see the file COPYING. If not, see |
| 18 ## <http://www.gnu.org/licenses/>. | |
| 2537 | 19 |
| 3321 | 20 ## -*- texinfo -*- |
| 21 ## @deftypefn {Mapping Function} {} pow2 (@var{x}) | |
| 22 ## @deftypefnx {Mapping Function} {} pow2 (@var{f}, @var{e}) | |
| 23 ## With one argument, computes | |
| 24 ## @iftex | |
| 25 ## @tex | |
| 26 ## $2^x$ | |
| 27 ## @end tex | |
| 28 ## @end iftex | |
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29 ## @ifnottex |
| 3321 | 30 ## 2 .^ x |
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31 ## @end ifnottex |
| 3321 | 32 ## for each element of @var{x}. With two arguments, returns |
| 33 ## @iftex | |
| 34 ## @tex | |
| 35 ## $f \cdot 2^e$. | |
| 36 ## @end tex | |
| 37 ## @end iftex | |
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38 ## @ifnottex |
| 3321 | 39 ## f .* (2 .^ e). |
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40 ## @end ifnottex |
| 5642 | 41 ## @seealso{nextpow2} |
| 3321 | 42 ## @end deftypefn |
| 2537 | 43 |
| 44 ## Author: AW <Andreas.Weingessel@ci.tuwien.ac.at> | |
| 45 ## Created: 17 October 1994 | |
| 46 ## Adapted-By: jwe | |
| 47 | |
| 48 function y = pow2 (f, e) | |
| 3426 | 49 |
| 2537 | 50 if (nargin == 1) |
| 51 y = 2 .^ f; | |
| 52 elseif (nargin == 2) | |
| 53 y = f .* (2 .^ e); | |
| 54 else | |
| 6046 | 55 print_usage (); |
| 2537 | 56 endif |
| 57 | |
| 58 endfunction | |
| 7385 | 59 |
| 60 %!test | |
| 61 %! x = [3, 0, -3]; | |
| 62 %! v = [8, 1, .125]; | |
| 63 %! assert(all (abs (pow2 (x) - v) < sqrt (eps))); | |
| 64 | |
| 65 %!test | |
| 66 %! x = [3, 0, -3, 4, 0, -4, 5, 0, -5]; | |
| 67 %! y = [-2, -2, -2, 1, 1, 1, 3, 3, 3]; | |
| 68 %! z = x .* (2 .^ y); | |
| 7742 | 69 %! assert(all (abs (pow2 (x,y) - z) < sqrt (eps))); |
| 7385 | 70 |
| 71 %!error pow2(); | |
| 72 |