Python histogram outline

python matplotlib histogram
Brad Reed picture Brad Reed · Mar 11, 2017 · Viewed 73.8k times · Source

I have plotted a histogram in Jupyter (Python 2) and was expecting to see the outlines of my bars but this is not the case.

enter image description here

I'm using the following code:

import matplotlib.pyplot as plt
from numpy.random import normal
gaussian_numbers = normal(size=1000)
plt.hist(gaussian_numbers)
plt.title("Gaussian Histogram")
plt.xlabel("Value")
plt.ylabel("Frequency")
plt.show()

Answer

James picture James · Mar 12, 2017

It looks like either your linewidth was set to zero or your edgecolor was set to 'none'. Matplotlib changed the defaults for these in 2.0. Try using: 

plt.hist(gaussian_numbers, edgecolor='black', linewidth=1.2)

enter image description here

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