[Python] Why do I get a division by zero error when plotting inverse function on secondary...

I get a division by zero error when I run the following python script.

import matplotlib.pyplot as plt

fig, ax = plt.subplots(figsize=(10, 10))

freq = [0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, 1.6, 1.8, 2.0]
amp = [0.0, 0.0, 0.0, 0.0, 0.0, 0.012, 0.031, 0.074, 0.082, 0.084, 0.080, 0.078, 0.072, 0.059, 0.039, 0.019, 0.010]
ax.semilogx(freq, amp, marker='s', color='purple')
plt.xlim(0.1, 10)
plt.xlabel('Frequency (Hz)')
plt.ylabel('Crest Loss (ft)')
ax.set(title='Fundamental Frequency')
ax.grid()
ax.grid(which="minor", color="0.9")

def forward(x):
return 1 / x

def inverse(x):
return 1 / x

secax = ax.secondary_xaxis('top', functions=(forward, inverse))
secax.set_xlabel('Period (s)')

plt.show()


The plot seems to output correctly, but I don't know why I get a division by zero error when all the data plotted on the x axis is greater than zero.

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