plt.hist density argument does not function as described. #10398
Description
Bug report
Bug summary
plt.hist density argument does not function as described.
Code for reproduction
import matplotlib.pyplot as plt
import numpy as np
x = np.asarray([0,0,0,0,1,1,2,2,2,2,3,3,3,3,3,3,3], dtype="float")
n, bins, _ = plt.hist(x, density=1, bins=2)
print(n)
print(np.sum(n))Actual outcome
[0.23529412 0.43137255]
0.6666666666666666
Expected outcome
import matplotlib.pyplot as plt
import numpy as np
x = np.asarray([0,0,0,0,1,1,2,2,2,2,3,3,3,3,3,3,3], dtype="float")
n, bins, _ = plt.hist(x, density=1, bins=2)
n /= np.sum(n) # As advertised
print(n)
print(np.sum(n))[0.35294118 0.64705882]
1.0
Matplotlib version
- Operating system: OSX High Sierra
- Matplotlib version: 2.1.1
- Matplotlib backend: MacOSX
- Python version: 3.6.4
- Other libraries: numpy 1.14.0
- Installed via: pip3