function dyp = van_der_pol_eq_linearized(dx,t,params)
% VAN_DER_POL_EQ - returns dy/dt for the linearized Van Der Pol equation
%   
% Written by:
% -- 
% John L. Weatherwax                2006-08-28
% 
% email: wax@alum.mit.edu
% 
% Please send comments and especially bug reports to the
% above email address.
% 
%-----

a = params(1);
b = params(2);
c = params(3); 

M = [ 0, 1; -b, -a*(1-(c/b)^2) ];
dyp = M * dx(:);