coscosh.m

来自「nonlinear eq routines in matlab」· M 代码 · 共 21 行

function varargout = coscosh(x)
%
% 
%
%  [y]    = coscosh(x)  returns the function value in y
%  [y,yp] = coscosh(x)  returns the function value in y and 
%                       the derivative in yp
%
%  Matthias Heinkenschloss
%  Department of Computational and Applied Mathematics
%  Rice University
%  March 29, 2001
%


% return the function value
varargout{1} = cos(x)*cosh(x)+1;
if( nargout > 1 )
  % return the derivative as the second argument
  varargout{2} = -sin(x)*cosh(x)+cos(x)*sinh(x);
end