function [L] = makelike2(thet,y);
q1=thet(1);     
q2=thet(2);
m=thet(3);
sig=thet(4);

F = [0 0 0; 1 0 0; 0 1 0];
H = [1 q1 q2];
Q = diag([sig 0 0]);
R = 0;
initx = [y(1)-m;0;0];
initV = 0.00000001*eye(3);
[xfilt, Vfilt, VVfilt, loglik] = kalman_filter(y-m, F, H, Q, R, initx, initV);
L=-loglik;

