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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Scaling difference in impulse response size compared to scipy.signal","articleBody":"### Discussed in https://github.com/python-control/python-control/discussions/747\r\n\r\n\u003cdiv type='discussions-op-text'\u003e\r\n\r\n\u003csup\u003eOriginally posted by **fhchl** June 29, 2022\u003c/sup\u003e\r\nI had some code that I wanted to port from using `scipy.signal.StateSpace` etc. to `python-control`. There seems to be some scaling difference between the two implementations. What am I overlooking?\r\n\r\n```python\r\nimport numpy as np\r\nimport control\r\nimport scipy.signal\r\n\r\n# random state space matrices\r\nt= np.linspace(0, 10, dtype=float)\r\nss = control.drss(3, 2, 1)\r\nA, B, C, D = ss.A, ss.B, ss.C, ss.D\r\ndt = t[1]\r\n\r\n# compute impulse response with python-control\r\nss = control.ss(A, B, C, D, dt=dt)\r\nt_control, h_control = control.impulse_response(ss, T=t)\r\nplt.figure()\r\nplt.plot(t_control, h_control[0, 0])\r\nplt.plot(t_control, h_control[1, 0])\r\n\r\n# compute impulse response with scipy.signal\r\nss_scipy = scipy.signal.StateSpace(A, B, C, D, dt=dt)\r\nt_scipy, (h_scipy,) = scipy.signal.dimpulse(ss_scipy, t=t)\r\nplt.figure()\r\nplt.plot(t_scipy, h_scipy[:, 0])\r\nplt.plot(t_scipy, h_scipy[:, 1])\r\n\r\nplt.show()\r\n```\r\n\r\nCreates these two here.\r\n\r\n![output](https://user-images.githubusercontent.com/6132231/176428542-02ded514-57bb-48ff-b7c2-902069f55e6c.png)\r\n\r\n![output](https://user-images.githubusercontent.com/6132231/176428644-f5295a57-3519-41d4-9c9b-32f302789432.png)\u003c/div\u003e","author":{"url":"https://github.com/sawyerbfuller","@type":"Person","name":"sawyerbfuller"},"datePublished":"2022-12-10T10:39:57.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":0},"url":"https://github.com/813/python-control/issues/813"}