[FIXED] Plotting lambda function

Issue

I am trying to plot a function which is defined via a lambda. I always get the error message:

x and y must have the same first dimension but have shapes (20,) and (1,)

But I have no idea why.

import numpy as np
import matplotlib.pyplot as plt

x = np.linspace(-4,8,20)
print(x)
fx = lambda x: x - 10 * np.exp(-1/10*((x-2)**2)) 
plt.plot(x, fx)
plt.show()

Solution

fx is a lambda function, x is a list. You shall first compute all the results and then pass it to the plot:

x  = np.linspace(-4,8,20)
fx = lambda x: x - 10 * np.exp(-1/10*((x-2)**2)) 
y  = [fx(val) for val in x] # Not sure, maybe you need to use Numpy too instead ? Not a expert of Numpy

plt.plot(x, y)

Answered By - Metapod