|
7017
|
1 ## Copyright (C) 1994, 1996, 1997, 1999, 2000, 2005, 2006, 2007 |
|
|
2 ## John W. Eaton |
|
2313
|
3 ## |
|
|
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. |
|
2313
|
10 ## |
|
|
11 ## Octave is distributed in the hope that it will be useful, but |
|
|
12 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
|
|
13 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
|
|
14 ## General Public License for more details. |
|
|
15 ## |
|
|
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/>. |
|
2303
|
19 |
|
3321
|
20 ## -*- texinfo -*- |
|
3428
|
21 ## @deftypefn {Mapping Function} {} asec (@var{x}) |
|
|
22 ## Compute the inverse secant of each element of @var{x}. |
|
3321
|
23 ## @end deftypefn |
|
2311
|
24 |
|
2314
|
25 ## Author: jwe |
|
|
26 |
|
713
|
27 function w = asec (z) |
|
2325
|
28 |
|
713
|
29 if (nargin != 1) |
|
6046
|
30 print_usage (); |
|
713
|
31 endif |
|
|
32 |
|
|
33 w = acos (1 ./ z); |
|
2325
|
34 |
|
2326
|
35 endfunction |
|
7385
|
36 |
|
|
37 %!test |
|
|
38 %! rt2 = sqrt (2); |
|
|
39 %! rt3 = sqrt (3); |
|
|
40 %! v = [0, pi/6, pi/4, pi/3, 2*pi/3, 3*pi/4, 5*pi/6, pi]; |
|
|
41 %! x = [1, 2*rt3/3, rt2, 2, -2, -rt2, -2*rt3/3, -1]; |
|
|
42 %! assert(all (abs (asec (x) - v) < sqrt (eps)) |
|
|
43 %! |
|
|
44 %! ); |
|
|
45 |
|
|
46 %!error asec (); |
|
|
47 |
|
|
48 %!error asec (1, 2); |
|
|
49 |
