A figure and four plots (axes) in one row, to draw on one by one.

An f-string: the value of t goes in place of {t}.

For small swings, T = 2π√(L / g): four times longer means twice as slow.

Where a pendulum is within its swing; here, the cosine of 2π·t / T.

Rounds every number of an array to one decimal place.

Pendulum wave · Python

Flashcards for Python lesson 5: Formulas on arrays

Read the front, say the back to yourself, then open the card.

plt.subplots(1, 4)

A figure and four plots (axes) in one row, to draw on one by one.
f"t = {t} s"

An f-string: the value of t goes in place of {t}.
Pendulum period

For small swings, T = 2π√(L / g): four times longer means twice as slow.
Phase

Where a pendulum is within its swing; here, the cosine of 2π·t / T.
np.round(x, 1)

Rounds every number of an array to one decimal place.