How to plot a histogram using Matplotlib in Python taking probability?

Question

I have taking probability using randint function. but i am facing issue in histogram to show my probability. my Probability output like this.

{60: 0.013, 6: 0.016, 99: 0.01, 25: 0.006, 45: 0.017, 51: 0.009, 72: 0.011, 8: 0.015, 10: 0.015, 82: 0.011, 50: 0.014, 43: 0.012, 52: 0.011, 74: 0.015, 12: 0.015, 39: 0.01, 89: 0.014, 7: 0.009}

My python code.

from collections import Counter
import numpy as np
import matplotlib.pyplot as plt

hist = np.random.randint(low=1, high=100, size=1000)
counts = Counter(hist)
total = sum(counts.values())
hist = {k:v/total for k,v in counts.items()}


num_bins = 10
n, bins, patches = plt.hist(hist, num_bins, normed=1, facecolor='blue', alpha=0.5)
#plt.plot(bins, hist, 'r--')
plt.xlabel('Grades')
plt.ylabel('Probability')
plt.title('Histogram of Students Grade')
plt.subplots_adjust(left=0.15)
plt.show()

It was mistake. i comment this plt.plot(bins, hist, 'r--') i need just my Probabilty Histogram. where the issue occurs ? — Humair Ali
– Humair Ali, Commented Dec 12, 2019 at 21:14
What is the problem exactly? Can you show us the plot you are getting now and explain what it is that you want to look different? — Francisca Concha-Ramírez
– Francisca Concha-Ramírez, Commented Dec 13, 2019 at 12:39
@FranciscaConcha-Ramírez when you run this code i am getting this error '<' not supported between instances of 'dict' and 'float'. and the graph was empty. — Humair Ali
– Humair Ali, Commented Dec 13, 2019 at 15:20
@FranciscaConcha-Ramírez i think their will use Dict and float function to seprate the values first then do the Histogram. like {60: 0.013, 6: 0.016, 99: 0.01} do you understand my issue ? — Humair Ali
– Humair Ali, Commented Dec 13, 2019 at 15:32

petezurich · Accepted Answer · 2019-12-12 19:00:13Z

2

If you just comment out plt.plot(bins, hist, 'r--') you get this plot:

Is this what you are looking for?

If you want to make use of n, bins and patches you can refer to this example in the Matplotlib documentation.

edited Dec 12, 2019 at 19:00

answered Dec 12, 2019 at 18:45

petezurich

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4 Comments

Humair Ali Over a year ago

Actually, i need just my Probabilty Histogram.. can you Edit my code ?

petezurich Over a year ago

I'm not sure I understand you correctly. Isn't this exactly what the graph shows?

Humair Ali Over a year ago

this is my output of probabilty {60: 0.013, 6: 0.016, 99: 0.01, 25: 0.006, 45: 0.017, 51: 0.009, 72: 0.011, 8: 0.015, 10: 0.015, 82: 0.011} now i want graph in x-axis and y-axis. like 60 in y-axis and 0.013 in x-axis in graph.

Humair Ali Over a year ago

i am facing this error TypeError: '<' not supported between instances of 'dict' and 'float'

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