I create a transfer function in simulink, drive it with a step input to look at open loop response, and observe the response on a scope. I create the same model in matlab, drive it with a step, and get a completely different response. I do not understand why. Here are the two models:
SImulink Step block (parameter range 0-1) Transfer Fcn block, 1/s^^2 + 10s +20 (Num coeff = 1 , Denon coeff = [1 10 20] ) Scope block
Matlab: s = tf('s'); P = 1/(s^2 + 10*s + 20); step(P)
I have varied the ode soln approach, checked parameter ranges and types, still no joy. The matlab approach produces the correct results btw. ANy insight is really appreciated.