### 2.37.27 Number of elements smaller than a given value : `count_inf`

`count_inf` takes as argument : a real and a real list
(or matrix).

`count_inf` returns the number of elements of the list (or matrix) which
are strictly inferior to the first argument.

Input :

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

Output :

`3`