How can I fix this line

import numpy as np

import matplotlib.pyplot as plt

from scipy import stats

 

mu, sigma = 0,2

x= mu + sigma*np.random.randn(25000)

n, bins, patches = plt.hist(x, 25, facecolor='blue', alpha=0.75)

 

import matplotlib.mlab as mlab

y = mlab.normpdf( bins, mu, sigma)

l = plt.plot(bins, y, 'r--', linewidth=5)

plt.xticks(fontsize=12, rotation=0)

plt.yticks(fontsize=12, rotation=90)

plt.xlabel('x', fontsize=16, color='blue')

plt.ylabel('normal', fontsize=16, color='blue')

plt.title(r'$\mathrm{Histogram\ of\ IQ:}\ \mu=0.0, \ \sigma=2.0$')

NameError
Traceback (most recent call last)
  <command-1361783690544063> in <cell line: 1>()
    ----> 1 plt.title(r'$\mathrm{Histogram\ of\ IQ:}\ \mu=0.0, \ \sigma=2.0$')
NameError: name 'plt' is not defined

I tried removing line 16, I tried removing section of the code.

First, matplotlib.mlab.normpdf has been deprecated for years now (more than a decade actually), you should use scipy.stats.norm.pdf instead

The fact that a single line executes and that you're not calling plt.show() indicates that you may be using a notebook, in which case you should make sure that you call the imports before the remaining of the code

After correcting the normpdf thing the code works for me:

import numpy as np
import matplotlib.pyplot as plt

from scipy.stats import norm

mu, sigma = 0, 2

x = mu + sigma * np.random.randn(25000)

n, bins, patches = plt.hist(x, 25, facecolor="blue", alpha=0.75)

y = norm.pdf(bins, mu, sigma)

plt.plot(bins, y, "r--", linewidth=5)

plt.xticks(fontsize=12, rotation=0)
plt.yticks(fontsize=12, rotation=90)

plt.xlabel("x", fontsize=16, color="blue")
plt.ylabel("normal", fontsize=16, color="blue")

plt.title(r"$\mathrm{Histogram\ of\ IQ:}\ \mu=0.0, \ \sigma=2.0$")

plt.show()

Which yields this

Lastly, I hope this is not the real IQ distribution :')