Edit - Stack Overflow

You are not logged in. Your edit will be placed in a queue until it is peer reviewed.

We welcome edits that make the post easier to understand and more valuable for readers. Because community members review edits, please try to make the post substantially better than how you found it, for example, by fixing grammar or adding additional resources and hyperlinks.

Required fields*

Rev

3

What if I want to access the number of occurences of each unique elements of the array without assigning to the variable - counts. Any hints on that ?

sajis997
– sajis997

2016-12-24 23:08:12 +00:00
Commented Dec 24, 2016 at 23:08
1

I have the same goal as @sajis997. I want to use 'count' as an aggregating function in a groupby

p_sutherland
– p_sutherland

2018-03-15 16:34:35 +00:00
Commented Mar 15, 2018 at 16:34
9

this is a hack. Numpy has functions for this called bincount() or histogram()

john k
– john k

2018-10-22 03:01:22 +00:00
Commented Oct 22, 2018 at 3:01
7

Tried using both methods for a very large array (~30Gb). Numpy method ran out of memory whereas the collections.Counter worked just fine

Ivan Novikov
– Ivan Novikov

2019-11-26 13:10:52 +00:00
Commented Nov 26, 2019 at 13:10
2

For those wondering, this answer works for any type of np array (e.g. it works for floats), unlike some of the answers provided.

waykiki
– waykiki

2021-08-10 10:27:24 +00:00
Commented Aug 10, 2021 at 10:27

| Show 6 more comments

Correct minor typos or mistakes
Clarify meaning without changing it
Add related resources or links
Always respect the author’s intent
Don’t use edits to reply to the author

create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

formatting help »
answering help »

Collectives™ on Stack Overflow