Mercurial > octave-nkf
view scripts/elfun/acsc.m @ 20643:d6d04088ac9e
nbininv.m: Increase speed (85X) and accuracy of function (bug #34363).
* nbininv.m: Call new function scalar_nbininv to calculate nbininv for scalar.
If there are still uncalculated values then call bin_search_nbininv. Call
bin_search_nbininv directly for vectors. Add more BIST tests.
* nbininv.m (scalar_binoinv): New subfunction to calculate nbininv for scalar x.
Stops when x > 1000.
* nbininv.m (bin_search_nbininv): New subfunction to do binary search for nbininv.
author | Lachlan Andrew <lachlanbis@gmail.com> |
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date | Sun, 11 Oct 2015 20:33:37 -0700 |
parents | 4197fc428c7d |
children |
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## Copyright (C) 1994-2015 John W. Eaton ## ## This file is part of Octave. ## ## Octave is free software; you can redistribute it and/or modify it ## under the terms of the GNU General Public License as published by ## the Free Software Foundation; either version 3 of the License, or (at ## your option) any later version. ## ## Octave is distributed in the hope that it will be useful, but ## WITHOUT ANY WARRANTY; without even the implied warranty of ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU ## General Public License for more details. ## ## You should have received a copy of the GNU General Public License ## along with Octave; see the file COPYING. If not, see ## <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Mapping Function} {} acsc (@var{x}) ## Compute the inverse cosecant in radians for each element of @var{x}. ## @seealso{csc, acscd} ## @end deftypefn ## Author: jwe function y = acsc (x) if (nargin != 1) print_usage (); endif y = asin (1 ./ x); endfunction %!test %! rt2 = sqrt (2); %! rt3 = sqrt (3); %! v = [pi/6, pi/4, pi/3, pi/2, pi/3, pi/4, pi/6]; %! x = [2, rt2, 2*rt3/3, 1, 2*rt3/3, rt2, 2]; %! assert (acsc (x), v, sqrt (eps)); %!error acsc () %!error acsc (1, 2)