| ::tuple_ceil | Compute the ceiling function of a tuple. |
| ::tuple_deviation | Return the standard deviation of the elements of a tuple. |
| ::tuple_floor | Compute the floor function of a tuple. |
| ::tuple_is_number | Check a tuple (of strings) whether it represents numbers. |
| ::tuple_length | Returns the number of elements of a tuple. |
| ::tuple_max | Returns the maximal element of a tuple. |
| ::tuple_mean | Return the mean value of a tuple of numbers. |
| ::tuple_min | Returns the minimal element of a tuple. |
| ::tuple_sum | Return the sum of all elements of a tuple. |