Mercurial > octave
annotate scripts/elfun/secd.m @ 29358:0a5b15007766 stable
update Octave Project Developers copyright for the new year
In files that have the "Octave Project Developers" copyright notice,
update for 2021.
author | John W. Eaton <jwe@octave.org> |
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date | Wed, 10 Feb 2021 09:52:15 -0500 |
parents | a4268efb7334 |
children | 7854d5752dd2 |
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1 ######################################################################## |
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2 ## |
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3 ## Copyright (C) 2006-2021 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/>. |
6239 | 7 ## |
6440 | 8 ## This file is part of Octave. |
6239 | 9 ## |
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10 ## Octave is free software: you can redistribute it and/or modify it |
6440 | 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. |
6440 | 14 ## |
15 ## Octave is distributed in the hope that it will be useful, but | |
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. |
6239 | 19 ## |
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 ######################################################################## |
6239 | 25 |
26 ## -*- texinfo -*- | |
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27 ## @deftypefn {} {} secd (@var{x}) |
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28 ## Compute the secant for each element of @var{x} in degrees. |
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29 ## @seealso{asecd, sec} |
6239 | 30 ## @end deftypefn |
31 | |
32 function y = secd (x) | |
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33 |
6239 | 34 if (nargin != 1) |
35 print_usage (); | |
36 endif | |
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37 |
6239 | 38 y = 1 ./ cosd (x); |
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39 |
6239 | 40 endfunction |
41 | |
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42 |
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43 %!assert (secd (0:10:80), sec (pi*[0:10:80]/180), -10*eps) |
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44 %!assert (secd ([0, 180, 360]) != Inf) |
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45 %!assert (secd ([90, 270]) == Inf) |
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46 |
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47 %!error secd () |
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48 %!error secd (1, 2) |