qiskit/releasenotes/notes/0.19/fix_pwchebysev_constant_fx-...

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---
fixes:
- |
Fixed an issue in :obj:`.PiecewiseChebyshev` when the function to be
approximated was constant. In these cases, you should now pass the constant
directly as the ``f_x`` argument, rather than using a function, such as::
from qiskit.circuit.library.arithmetic import PiecewiseChebyshev
PiecewiseChebyshev(1.0, degree=3)
See `#6707 <https://github.com/Qiskit/qiskit-terra/pull/6707>`__ for more details.