fn:avg function
The fn:avg function returns the average of the values in a sequence.
Syntax
- sequence-expression
- A sequence that contains items of any of the following atomic
types, or an empty sequence:
- xs:double
- xs:decimal
- xs:integer
- xs:untypedAtomic
- xs:dayTimeDuration
- xs:yearMonthDuration
- A type that is derived from any of the previously listed types
Input items of type xs:untypedAtomic are cast to xs:double.
Returned value
If sequence-expression is not the empty sequence, the returned value is the average of the values in sequence-expression. The data type of the returned value is the same as the data type of the items in sequence-expression, or the data type to which the items in sequence-expression are promoted.
If sequence-expression is the empty sequence, the empty sequence is returned.
If sequence-expression has
two or more of the following data types, an error is returned:
- xs:dayTimeDuration
- xs:yearMonthDuration
- numeric data types
Example
The following function returns the average of the sequence (5, 1.0E2, 40.5):
fn:avg((5, 1.0E2, 40.5))The values are promoted to the xs:double data type. The function returns the xs:double value 4.85E1, which is serialized as "48.5".