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Adds functionality for calculating pendulum length #25

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Adds functionality for calculating pendulum length #25

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7487f6b
length example
dorchard Oct 1, 2025
65163de
Update pyndulum/pendulum_equations.py
dorchard Oct 1, 2025
deff81a
better function name
dorchard Oct 1, 2025
8c69af1
add type signature
dorchard Oct 1, 2025
7832e40
comments
dorchard Oct 1, 2025
42fb394
Merge branch 'main' into length
jatkinson1000 Oct 1, 2025
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14 changes: 13 additions & 1 deletion pyndulum/pendulum_equations.py
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,18 @@ def bpm(len: float) -> float:
"""
return 60.0 / get_period(len)

def length_from_period(p: float) -> float:
"""
Calculate the length of a pendulum based on period.

Parameters
----------
p : float
period [s] for a swing of the pendulum
length of the pendulum [m]
"""
return ((p / 2.0 * np.pi) ** 2) * 9.81

def energy(m: float, len: float, theta: float) -> float:
"""
Calculate the energy of a pendulum.
Expand All @@ -111,4 +123,4 @@ def energy(m: float, len: float, theta: float) -> float:
float
energy [kg . m2 /s2] of the pendulum
"""
return m * 9.81 * max_height(len, theta)
return m * 9.81 * max_height(len, theta)