if true
x0 = input('Enter the initial position [x y] - ');
tspan=[0,10*pi];
[t,x]=ode45(@simple,tspan,x0,[]);
plot(x(:,1),x(:,2));
title('Lorenz Model Trajectory XZ')
xlabel('X')
ylabel('Z')
end
but it give me error. i write equations in simple.m .