?? nndpend.m
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function yprime = nndpend(t,y)
%NNDPEND Dynamical model of a pendulum.
%
% NNDPEND(T,Y)
% T - Time
% Y - State = [angle; angular velocity]
% Returns Derivative of state vector.
% $Revision: 1.6 $
% Copyright 1994-2002 PWS Publishing Company and The MathWorks, Inc.
% First Version, 8-31-95.
%==================================================================
yprime = zeros(2,1);
yprime(1) = y(2);
yprime(2) = -sin(y(1)) - 0.2*y(2);
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