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It looks like PR #522 introduced some warning messages in our GitHub Action tests:
control/tests/freqresp_test.py::test_discrete[tf-0.1]
control/tests/freqresp_test.py::test_discrete[tf-0.1]
control/tests/freqresp_test.py::test_discrete[tf-True]
control/tests/freqresp_test.py::test_discrete[tf-True]
/home/runner/work/python-control/python-control/control/xferfcn.py:310: RuntimeWarning: divide by zero encountered in true_divide
out[i][j] = (polyval(self.num[i][j], x) /
control/tests/freqresp_test.py::test_discrete[tf-0.1]
control/tests/freqresp_test.py::test_discrete[tf-0.1]
control/tests/freqresp_test.py::test_discrete[tf-True]
control/tests/freqresp_test.py::test_discrete[tf-True]
/home/runner/work/python-control/python-control/control/xferfcn.py:310: RuntimeWarning: invalid value encountered in true_divide
out[i][j] = (polyval(self.num[i][j], x) /
I'm not quite sure what is generating the warnings, but it would be good to get rid of them if we can.
Test results here: https://github.com/python-control/python-control/pull/522/checks
@sawyerbfuller Any ideas?
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