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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"non-intuitive Time-Domain Simulation functions behavior","articleBody":"Hi, I notice that the simulation functions: `step_response`, `impulse_response`, for discrete time systems is not very intuitive, and is also inconsistent with matlab's behavior (I sort of have the habit of checking matlab documentation for a python-control function if there are suprises). \r\n\r\nConsider this snippet\r\n```python\r\nimport control as co\r\nimport numpy as np\r\nA1 = co.tf([1], [1, 6, 5])\r\nA1 = co.c2d(A1, 0.5)\r\nT, y = co.step_response(A1, np.arange(0, 5, 0.2))\r\n```\r\n\r\nwe would expect `T` to be the time instances that correspond to values in `y` (matlab behavior), but it turns out not the case. I got `T.shape = (25,)` while `y.shape=(1, 10)`.  The same behavior can be observed for other time-domain functions for discrete-time systems (continuous-time systems are alright).\r\n","author":{"url":"https://github.com/hungpham2511","@type":"Person","name":"hungpham2511"},"datePublished":"2018-10-25T03:41:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/239/python-control/issues/239"}