How to plot a list with random generated numbers using Matplotlib?

Question

I've generated a lot of numbers using Python, saving them in a list, and now I want to plot them in a scatter graph and a bar graph to see the patterns of the function that I created.

I'm getting numbers from 0 to 99,999,999 at maximum, I tried to plot but I failed.

In the bar graph the y axis should show how many times a number repeated itself in the range of the numbers generated and the x axis the number itself.

I tried to use the method collections.counter but it keeps returning me a dict with all the numbers that appeard at least one time in the list, instead of the ones that just repeated, with the data of the numbers that repeated I think I could plot the graph properly.

Image showing the data that i get from the function

One of your problems is that you store the numbers as strings instead of as numbers. — JohanC
– JohanC, Commented Jan 28, 2022 at 21:10
i also have a list with all of them, just int numbers, but i needed to use another function to get the number that each one repeats itself in a dictionary, i don't know if it is the most efficient way — Lucca Machado
– Lucca Machado, Commented Jan 28, 2022 at 21:19
For the dictionary, it is much better to create it using the integers directly as key, without converting them to strings. — JohanC
– JohanC, Commented Jan 28, 2022 at 22:59
I had a look at your data-in-a-picture, and well, except two numbers that have a count of two all the others appears only once in your list. I don't understand what you want to do, honest… Could you try to be more clear wrt what you want, especially with yourself? — gboffi
– gboffi, Commented Jan 29, 2022 at 9:30
basically i'm creating a function that will try to create random numbers, without using any library, then i'm storing them into a vector, i would like to have a graph that shows the numbers and if they repeat themselves but i can't figure how, i tried to use the collections.counter to get a dictionary with just the numbers that appears more than one time so i could plot in the graph — Lucca Machado
– Lucca Machado, Commented Jan 30, 2022 at 15:02

DanielTuzes · Accepted Answer · 2022-01-28 21:34:09Z

1

What would you like to plot in the scatter graph? Matplotlib has built-in histogram plotter.

import random
import matplotlib.pyplot as plt

random.seed(0)

ITER = 20
LOW = 0
HIGH = 10

RND_NUMS = []
for _ in range(ITER):
    RND_NUMS.append(random.randint(LOW, HIGH))

plt.hist(RND_NUMS, bins=range(0,10))

This produces something like:

edited Jan 28, 2022 at 21:34

answered Jan 28, 2022 at 21:17

DanielTuzes

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Zain · Accepted Answer · 2024-04-11 22:28:18Z

0

you can use NumPy unique with return count set as true, here is an example with 10 random numbers,

import numpy as np
import matplotlib.pyplot as plt
# random integer array
rand_array=np.random.randint(10, size=10)    
u, c=np.unique(rand_array, return_counts=True)

# plot 
fig, axs=plt.subplots(1, 2)
axs[0].bar(range(len(c)), c)
axs[0].set_xticks(range(len(c)),u)
axs[0].set_yticks(range(max(c)))    
axs[0].set_title('unique counts')

# selecting out the repeated ones
axs[1].bar(range(np.sum(c>1)), c[c>1])
axs[1].set_xticks(range(np.sum(c>1)),u[c>1])
axs[1].set_title('repeated ones')
axs[1].set_yticks(range(max(c)))
plt.show()

the output result is

answered Apr 11, 2024 at 22:28

Zain

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