Returns an integer representing the rank of the number in the specified array.
rank( number, array, [order] )
number: (Decimal) The number to be ranked
array: (Decimal Array) An array of numbers containing the number to be ranked
order: (Number) Use 0 to rank the array elements from high to low and 1 to rank the array in ascending order.
Integer
rank(2,{1,2,3,4},0)
returns 3