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The explicit error is:

Traceback (most recent call last): ps_a=phi_p+4.0dFx

File "", line 1, in <module>

File "/tmp/tmp7lgeO4/___code___.py", line 26, in <module>

AmpP =[(amp(State=r)).n() for r in srange(Tst)]

File "expression.pyx", line 3902, in sage.symbolic.expression.Expression._numerical_approx (sage/symbolic/expression.cpp:17489)

File "expression.pyx", line 816, in sage.symbolic.expression.Expression._convert (sage/symbolic/expression.cpp:4951)

File "pynac.pyx", line 1369, in sage.symbolic.pynac.py_atan2 (sage/symbolic/pynac.cpp:12772)

ValueError: arctan2(0,0) undefined