CODEWITHSUNDEEP
pythongraphnumpymatplotlib
Relrin
Relrin

Reputation: 790

Histogram in matplotlib work incorrect

For example: 

import matplotlib.pyplot as plt  
data = [0.6, 0.8, 0.4, 0.2, 0.6, 0.8, 0.4, 0.2]  
plt.hist(data, bins=20, range=[0.0, 1.0], normed=True)  
plt.show()

And after this i taken histogram, where frequency for every item about 5, not 0.25%. How i can fix this?

Upvotes: 0

Views: 1588

Answers (1)

Developer
Developer

Reputation: 8400

You could check the histogram result by assigning plt.hist as follows:

out = plt.hist(data, bins=20)
print out

which prints:

(array([2, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 0, 2, 0, 0, 0, 0, 0, 2]), 
 array([0.2 , 0.23, 0.26, 0.29, 0.32, 0.35, 0.38, 0.41, 0.44, 0.47, 
        0.5 , 0.53, 0.56, 0.59, 0.62, 0.65, 0.68, 0.71, 0.74, 0.77, 0.8 ]),
<a list of 20 Patch objects>)

which is correct. also:

>>> plt.hist(data, bins=4)
    (array([ 2.,  2.,  2.,  2.]), array([ 0.2 ,  0.35,  0.5 ,  0.65,  0.8 ]), 
    <a list of 4 Patch objects>)

Upvotes: 1

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