Pandas ‘count(distinct)’ equivalent
I believe this is what you want: Example:
count
How to count the occurrence of certain item in an ndarray?
Non-numpy way: Use collections.Counter;
How can I count the occurrences of a list item?
If you only want one item’s count, use the count method: Important Note regarding count performance Don’t use this if you want to count multiple items. Calling count in a loop requires a separate pass over the list for every count call, which can be catastrophic for performance. If you want to count all items, or even just multiple items, use Counter, … Read more
PHP 7.2 – Warning: count(): Parameter must be an array or an object that implements Countable
PDO fetch returns false on failure. So you need to check this case too:
Counting the number of elements with the values of x in a vector
You can just use table(): Then you can subset it: Or convert it into a data.frame if you’re more comfortable working with that: