# Counting the elements smaller than a given value: count_inf

### 5.45.14 Counting the elements smaller than a given value: count_inf

The count_inf command counts the number of elements in a matrix less than a given value.

- count_inf takes two arguments:
  - a, a real number.
  - A, a matrix or a list of real numbers.
- count_inf(a,A) returns the number of elements of A that are strictly less than a.

#### Example.

Input:

count_inf(12,[2,12,45,3,7,78])

Output:

3