Two-Dimensional array (IndexError: list index out of range)

Question

I'm trying to make an algorithm, which counts how many numbers are divided without a remainder.

d=[]
for i in range (0, 10001):
    for c in range (1, 16):
        if i % c == 0: d[c] += 1

I expect to have something like this

, but i get IndexError: list index out of range

NPE · Accepted Answer · 2019-07-10 19:58:13Z

2

Just fill the list with zeros:

d = [0] * 17  # <== THIS
for i in range (0, 10001):
    for c in range (1, 16):
        if i % c == 0: d[c] += 1

Note that this has an extraneous zero at the start (i.e. d[0]). Very easy to ignore.

Also, your counts are off by one compared to what your code actually does (for example, there are 10001 even numbers in your range and not 10000).

answered Jul 10, 2019 at 19:58

NPE

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Comments

Scott Hunter · Accepted Answer · 2019-07-10 19:58:06Z

2

You can't add to an element of a list that has never been created.

answered Jul 10, 2019 at 19:58

Scott Hunter

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