I got this error: "f x and y must have same first dimension but have shapes python"

Question

import sympy as sy
import matplotlib.pyplot as plt
import numpy as np

x = sy.symbols('x')
print("function:")
f = str(input())

#
df1 = sy.diff(f)
df2 = sy.diff(df1)
df3 = sy.diff(df2)

#Volvemos estas funciones simbolicas a numericas.
nf = sy.lambdify( x, f, "numpy")
ndf1 = sy.lambdify( x, df1, "numpy")
ndf2 = sy.lambdify( x, df2, "numpy")
ndf3 = sy.lambdify( x, df3, "numpy")

#
print("domain")
a = int(input())
b = int(input())
z = np.arange(a, b)

plt.plot(z,nf, color='purple', label='nf', marker=',')
plt.show()

Answer 1

Your issue is that you are creating a function and plotting only the function call. You need to apply the function to your data so you can then plot it. So all you have to do is change your plotting line to the following.

plt.plot(z,nf(z), color='purple', label='nf', marker=',')