### 2.37.26 Number of elements equal to a given value : `count_eq`

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

`count_eq` returns the number of elements of the list (or matrix)
which are equal to the first argument.

Input :

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

Output :

`1`