## Copyright (C) 2006, 2007 Thomas Kasper, <thomaskasper@gmx.net> ## ## This program 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 2 of the License, or ## (at your option) any later version. ## ## This program 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 this program; If not, see <http://www.gnu.org/licenses/>. ## -*- texinfo -*- ## @deftypefn {Mapping Function} {} gradcot (@var{x}) ## overloads mapping function @code{cot} for a gradient @var{x} ## @end deftypefn ## @seealso{cot} ## PKG_ADD: dispatch ("cot", "gradcot", "gradient") ## for performance only, works just as fine with cot.m function retval = gradcot (g) if nargin != 1 usage ("gradcot (g)"); endif g.x = 1 ./ tan (g.x); tmp = -(g.x(:) .^ 2).' - 1; r = size (g.dx, 1); g.dx = g.dx .* tmp(ones (1, r), :); retval = g; endfunction

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