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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"control.matlab.markov does not work","articleBody":"Hi,\r\nI am new to this and it might be a silly doubt but since i could not find an answer anywhere, I am opening an issue here.\r\n\r\nMy problem is that I need to estimate initial states for my state space model. This requires that I find the markov parameters. I checked the documentation and tried the following example.\r\n`import control.matlab as mt\r\ninp=np.array([1,2])\r\noutp=np.array([2,4])\r\nmrk= mt.markov(outp,inp,1)`\r\n\r\nI just took one input and one output as shown above and tried to run the code. It always gives me the following error\r\n\r\n\"Traceback (most recent call last):\r\n\r\n  File \"\u003cipython-input-10-c31db07b63e1\u003e\", line 3, in \u003cmodule\u003e\r\n    mrk= mt.markov(outp,inp,1)\r\n\r\n  File \"C:\\Users\\Gopal123\\Anaconda3\\lib\\site-packages\\control\\modelsimp.py\", line 421, in markov\r\n    Ulast = np.vstack((0, np.reshape(UU[0:n-1, m-2], (-1, 1))))\r\n\r\nIndexError: too many indices for array\r\n\"\r\nI am not able to understand the reason for this. I'd appreciate it if anyone can help me out. Thanks.\r\n","author":{"url":"https://github.com/nrgopalrao","@type":"Person","name":"nrgopalrao"},"datePublished":"2020-04-22T13:09:30.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":6},"url":"https://github.com/395/python-control/issues/395"}