datatype強制性改變，提示TypeError: only length-1 arrays can be converted to Python scalars

參考自stackoverflow上的答案

import numpy as np
import matplotlib.pyplot as plt

def f(x):
    return np.int(x)
f2 = np.vectorize(f)#讓函數矩陣化，解決只能一對一強制性變換這一要求
x = np.arange(1, 15.1, 0.1)
plt.plot(x, f2(x))
plt.show()