### 2.42.29 Count the elements smaller than a given value : `count_inf`

`count_inf` takes as arguments: a real and a real list or a real
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`