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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Scalar / Array mismatches in iosys not compatible with NumPy 1.24","articleBody":"### Discussed in https://github.com/python-control/python-control/discussions/852\r\n\r\n\u003cdiv type='discussions-op-text'\u003e\r\n\r\n\u003csup\u003eOriginally posted by **codeFighter2022** January 26, 2023\u003c/sup\u003e\r\nHi,\r\nFirst of all, thanks a lot for this amazing toolbox!\r\n\r\nI think, I found a bug, or a suggestion for improvement, when running the prey example:\r\nhttps://python-control.readthedocs.io/en/0.9.3.post2/iosys.html#example\r\n\r\nWhen I run the code of the prey example, in particular the linearization, \r\n`lin_predprey = ct.linearize(io_predprey, xeq, 0)`\r\nI get the following error\r\n`ValueError: setting an array element with a sequence. The requested array has an inhomogeneous shape after 1 dimensions. The detected shape was (2,) + inhomogeneous part.`\r\n\r\nAfter analyzing the code, I think the origin of the error is that in predprey_rhs() dH is of type numpy arrary, while dL is not. \r\n\r\nI think others ones are much deeper in the code than me. That is why I post this topic instead of a pull request. \r\n\r\nMaybe a type check with dummy input/output data already solves these kind of issues when initializing the constructor. I think such a feature could save people some time.\r\n\r\nBest,\r\ncodeFighter2022\r\n\r\nPython: 3.810\r\nControl: 0.9.3.post2\r\nI installed the toolbox via pip\r\n\u003c/div\u003e","author":{"url":"https://github.com/bnavigator","@type":"Person","name":"bnavigator"},"datePublished":"2023-01-26T20:50:32.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/853/python-control/issues/853"}