How do I plot a list all at once with matplotlib.pyplot?

Question

I created a program that works out primes. It was just a test but I thought it would be interesting to then plot this on a graph.

import matplotlib.pyplot as plt

max = int(input("What is your max no?: "))
primeList = []

for x in range(2, max + 1):
  isPrime = True
  for y in range (2 , int(x ** 0.5) + 1):
     if x % y == 0:
        isPrime = False
        break

     if isPrime:
        primeList.append(x)


print(primeList)

How can I then plot primeList, can I do it all at once outside of the for loop?

Currently you're not plotting anything? Also, what would you plot against on your x-axis? You just need to supply x/y pairs in lists of equal length. — roganjosh
– roganjosh, Commented Feb 12, 2017 at 21:01
I had an extra block of code that plotted that and a variable called itemsInList which was the amount of items in primeList — Einstein.py
– Einstein.py, Commented Feb 12, 2017 at 21:06

Mike Müller · Accepted Answer · 2017-02-12 21:19:03Z

1

This plots your list vs. its index:

from matplotlib import pyplot as plt

plt.plot(primeList, 'o')
plt.show()

This program:

from matplotlib import pyplot as plt

max_= 100
primeList = []

for x in range(2, max_ + 1):
    isPrime = True
    for y in range (2, int(x ** 0.5) + 1):
        if x % y == 0:
            isPrime = False
            break
    if isPrime:
        primeList.append(x)

plt.plot(primeList, 'o')
plt.show()

yields this plot:

edited Feb 12, 2017 at 21:19

answered Feb 12, 2017 at 21:12

Mike Müller

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