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Title: fix damp method for discrete time systems with a negative real-valued pole by vincentchoqueuse · Pull Request #647 · python-control/python-control · GitHub

Open Graph Title: fix damp method for discrete time systems with a negative real-valued pole by vincentchoqueuse · Pull Request #647 · python-control/python-control

X Title: fix damp method for discrete time systems with a negative real-valued pole by vincentchoqueuse · Pull Request #647 · python-control/python-control

Description: (first pull request on GitHub) When a discrete time system has a real-valued negative pole, the discrete to continuous conversion using the log function returns nan. Then, the damp method is not able to compute the damping and the wn values. To avoid this problem, the poles must be cast to complex values (https://numpy.org/doc/stable/reference/generated/numpy.log.html)

Open Graph Description: (first pull request on GitHub) When a discrete time system has a real-valued negative pole, the discrete to continuous conversion using the log function returns nan. Then, the damp method is not ab...

X Description: (first pull request on GitHub) When a discrete time system has a real-valued negative pole, the discrete to continuous conversion using the log function returns nan. Then, the damp method is not ab...

Opengraph URL: https://github.com/python-control/python-control/pull/647

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78b6fc2 fix the return of the damp method for discrete time systems with a ne… vincentchoqueuse Aug 17, 2021 https://github.com/python-control/python-control/pull/647/commits/78b6fc255c5d4708b21960619e66751d47abe8d5
140ca08 fix PEP8 compliance style and preserve pole type vincentchoqueuse Aug 18, 2021 https://github.com/python-control/python-control/pull/647/commits/140ca08fc7ad3dc64b1b5dcb28327ec8647cb205
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