function force = Force(x,prm) % The derivative is different for negative and positive positions if x < 0 force = -2*prm*(x+1); else force = -2*prm*(x-1); end end
function force = Force(x,prm) % The derivative is different for negative and positive positions if x < 0 force = -2*prm*(x+1); else force = -2*prm*(x-1); end end