Trying to compare array but getting "ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()"

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Can someone help me understand and correct my short code for the error in the title?

import matplotlib.pyplot as plt
import numpy as np

x = np.linspace(0, 1, 100)
a = 2

def f(x):
    if x<0.5:
        return a*x
    elif x>=0.5:
        return a*(1-x)

plt.plot(x, f(x))
plt.show()

      6 
      7 def f(x):
----> 8     if x<0.5:
      9         return a*x
     10     elif x>=0.5:


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