Top "Count" questions

How can I count the occurrences of a list item?

Given an item, how can I count its occurrences in a list in Python?

python list count

Counting the number of elements with the values of x in a vector

I have a vector of numbers: numbers <- c(4,23,4,23,5,43,54,56,657,67,67,435, 453,435,324,34,456,56,567,65,34,435) How can I have R count the number of times …

r vector count r-faq

Count the number occurrences of a character in a string

What's the simplest way to count the number of occurrences of a character in a string? e.g. count the …

python string count

jQuery: count number of rows in a table

How do I count the number of tr elements within a table using jQuery? I know there is a similar …

jquery count row

How to efficiently count the number of keys/properties of an object in JavaScript?

What's the fastest way to count the number of keys/properties of an object? It it possible to do this …

javascript performance properties count key

How to use count and group by at the same select statement

I have an sql select query that has a group by. I want to count all the records after the …

sql count group-by

SQL query for finding records where count > 1

I have a table named PAYMENT. Within this table I have a user ID, an account number, a ZIP code …

sql count group-by having

How to count the occurrence of certain item in an ndarray?

In Python, I have an ndarray y that is printed as array([0, 0, 0, 1, 0, 1, 1, 0, 0, 0, 0, 1]) I'm trying to count how many 0s and …

python numpy multidimensional-array count

How to sort a list of objects based on an attribute of the objects?

I've got a list of Python objects that I'd like to sort by an attribute of the objects themselves. The …

python list sorting oop count

Find duplicate lines in a file and count how many time each line was duplicated?

Suppose I have a file similar to the following: 123 123 234 234 123 345 I would like to find how many times '123' was …

file count find duplicates lines