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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Complex numbers in state space matrices get cast to real in `control.StateSpace(...)` constructor - a bug?","articleBody":"I noticed that if I have complex numbers in my A,B,C,D state space matrices, there's casting complex numbers to real in `control.StateSpace(A,B,C,D)` which does not appear to be right (?) if there's imaginary part. Is it intentional? Is there a way around it?\r\n\r\nSpecifically, I think this line is responsible: https://github.com/python-control/python-control/blob/main/control/statesp.py#L2170. Note `dtype=float`. I have matrices with `dtype=complex128`. Minimally reproducible example (matrices are completely made up here, of course the real state space I'm working with is more realistic but also much bigger):\r\n\r\n```python\r\nfrom control import StateSpace\r\nimport numpy as np\r\nA = np.array([[1+1j,1+1j],[1+1j,1+1j]])\r\nB = np.array([[1+1j,1+1j],[1+1j,1+1j]])\r\nC = np.array([[1+1j,1+1j],[1+1j,1+1j]])\r\nD = np.array([[1+1j,1+1j],[1+1j,1+1j]])\r\nss = StateSpace(A,B,C,D)\r\n```\r\nresults in \r\n```statesp.py:2170: ComplexWarning: Casting complex values to real discards the imaginary part  arr = np.array(data, dtype=float)```","author":{"url":"https://github.com/artem-basalaev","@type":"Person","name":"artem-basalaev"},"datePublished":"2024-11-13T14:52:02.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":1},"url":"https://github.com/1058/python-control/issues/1058"}