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3 changes: 3 additions & 0 deletions pyndulum/pendulum_equations.py
Original file line number Diff line number Diff line change
Expand Up @@ -92,3 +92,6 @@ def bpm(len: float) -> float:
pendulum frequency in beats per minute [1 / min]
"""
return 60.0 / get_period(len)

def inv(p):
return ((p / 2.0 * np.pi) ** 2) / 9.81