Mercurial > octave
annotate scripts/elfun/csc.m @ 23084:ef4d915df748
maint: Merge stable to default.
author | John W. Eaton <jwe@octave.org> |
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date | Mon, 23 Jan 2017 14:27:48 -0500 |
parents | 3a2b891d0b33 e9a0469dedd9 |
children | 092078913d54 |
rev | line source |
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1 ## Copyright (C) 1994-2016 John W. Eaton |
2313 | 2 ## |
3 ## This file is part of Octave. | |
4 ## | |
5 ## Octave is free software; you can redistribute it and/or modify it | |
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 |
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8 ## (at your option) any later version. |
2313 | 9 ## |
10 ## Octave is distributed in the hope that it will be useful, but | |
11 ## WITHOUT ANY WARRANTY; without even the implied warranty of | |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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13 ## GNU General Public License for more details. |
2313 | 14 ## |
15 ## You should have received a copy of the GNU General Public License | |
7016 | 16 ## along with Octave; see the file COPYING. If not, see |
17 ## <http://www.gnu.org/licenses/>. | |
2303 | 18 |
3321 | 19 ## -*- texinfo -*- |
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20 ## @deftypefn {} {} csc (@var{x}) |
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21 ## Compute the cosecant for each element of @var{x} in radians. |
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22 ## @seealso{acsc, cscd, csch} |
3321 | 23 ## @end deftypefn |
2311 | 24 |
2314 | 25 ## Author: jwe |
26 | |
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27 function y = csc (x) |
2325 | 28 |
713 | 29 if (nargin != 1) |
6046 | 30 print_usage (); |
713 | 31 endif |
32 | |
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33 y = 1 ./ sin (x); |
2325 | 34 |
713 | 35 endfunction |
7385 | 36 |
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37 |
7385 | 38 %!test |
39 %! rt2 = sqrt (2); | |
40 %! rt3 = sqrt (3); | |
41 %! x = [pi/6, pi/4, pi/3, pi/2, 2*pi/3, 3*pi/4, 5*pi/6]; | |
42 %! v = [2, rt2, 2*rt3/3, 1, 2*rt3/3, rt2, 2]; | |
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43 %! assert (csc (x), v, sqrt (eps)); |
7385 | 44 |
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45 %!error csc () |
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46 %!error csc (1, 2) |