Mercurial > octave
annotate scripts/general/nextpow2.m @ 27923:bd51beb6205e
update formatting of copyright notices
* Use <https://octave.org/copyright/> instead of
<https://octave.org/COPYRIGHT.html/>.
* For consistency with other comments in the Octave sources, use
C++-style comments for copyright blocks in C and C++ files.
* Use delimiters above and below copyright blocks that are appropriate
for the language used in the file.
* Eliminate extra spacing inside copyright blocks.
* lex.ll (looks_like_copyright): Also allow newlines and carriage
returns before the word "Copyright".
* scripts/mk-doc.pl (gethelp): Also skip empty comment lines.
* bp-table.cc, type.m: Adjust tests.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 08 Jan 2020 11:59:41 -0500 |
parents | 1891570abac8 |
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rev | line source |
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1 ######################################################################## |
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2 ## |
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3 ## Copyright (C) 1995-2020 The Octave Project Developers |
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4 ## |
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5 ## See the file COPYRIGHT.md in the top-level directory of this |
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6 ## distribution or <https://octave.org/copyright/>. |
3426 | 7 ## |
3922 | 8 ## This file is part of Octave. |
9 ## | |
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10 ## Octave is free software: you can redistribute it and/or modify it |
3922 | 11 ## under the terms of the GNU General Public License as published by |
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12 ## the Free Software Foundation, either version 3 of the License, or |
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13 ## (at your option) any later version. |
3426 | 14 ## |
3922 | 15 ## Octave is distributed in the hope that it will be useful, but |
2539 | 16 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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18 ## GNU General Public License for more details. |
3426 | 19 ## |
2539 | 20 ## You should have received a copy of the GNU General Public License |
7016 | 21 ## along with Octave; see the file COPYING. If not, see |
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22 ## <https://www.gnu.org/licenses/>. |
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23 ## |
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24 ######################################################################## |
2539 | 25 |
3321 | 26 ## -*- texinfo -*- |
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27 ## @deftypefn {} {@var{n} =} nextpow2 (@var{x}) |
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28 ## Compute the exponent for the smallest power of two larger than the input. |
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29 ## |
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30 ## For each element in the input array @var{x}, return the first integer |
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31 ## @var{n} such that |
3321 | 32 ## @tex |
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33 ## $2^n \ge |x|$. |
3321 | 34 ## @end tex |
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35 ## @ifnottex |
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36 ## 2^n @geq{} abs (x). |
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37 ## @end ifnottex |
3426 | 38 ## |
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39 ## @seealso{pow2, log2} |
3321 | 40 ## @end deftypefn |
2539 | 41 |
5428 | 42 ## Author: KH <Kurt.Hornik@wu-wien.ac.at> |
2539 | 43 ## Created: 7 October 1994 |
44 ## Adapted-By: jwe | |
45 | |
46 function n = nextpow2 (x) | |
3426 | 47 |
2539 | 48 if (nargin != 1) |
6046 | 49 print_usage (); |
2539 | 50 endif |
51 | |
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52 if (! isnumeric (x)) |
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53 error ("nextpow2: X must be numeric"); |
2816 | 54 endif |
3426 | 55 |
2539 | 56 [f, n] = log2 (abs (x)); |
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57 idx = (n == 0); # Find any failures of log2 function (n == 0) |
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58 n(idx) = f(idx); # and copy over value. |
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59 n(f == 0.5)--; |
3426 | 60 |
2539 | 61 endfunction |
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62 |
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63 |
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64 %!assert (nextpow2 (16), 4) |
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65 %!assert (nextpow2 (17), 5) |
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66 %!assert (nextpow2 (31), 5) |
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67 %!assert (nextpow2 (-16), 4) |
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68 %!assert (nextpow2 (-17), 5) |
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69 %!assert (nextpow2 (-31), 5) |
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70 %!assert (nextpow2 (1:17), [0 1 2 2 3 3 3 3 4 4 4 4 4 4 4 4 5]) |
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71 ## Special cases |
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72 %!assert (nextpow2 (0), 0) |
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73 %!assert (nextpow2 (1), 0) |
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74 %!assert (nextpow2 (Inf), Inf) |
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75 %!assert (nextpow2 (-Inf), Inf) |
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76 %!assert (nextpow2 (NaN), NaN) |
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77 %!assert (nextpow2 ([1, Inf, 3, -Inf, 9, NaN]), [0, Inf, 2, Inf, 4, NaN]) |
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78 |
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79 ## Test input validation |
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80 %!error nexpow2 () |
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81 %!error nexpow2 (1, 2) |
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82 %!error <X must be numeric> nextpow2 ("t") |