sequence.avg([field | function]) → number r.avg(sequence, [field | function]) → number
Averages all the elements of a sequence. If called with a field name, averages all the values of that field in the sequence, skipping elements of the sequence that lack that field. If called with a function, calls that function on every element of the sequence and averages the results, skipping elements of the sequence where that function returns null or a non-existence error.
Produces a non-existence error when called on an empty sequence. You can handle this case with default.
Example: What’s the average of 3, 5, and 7?
r.expr(r.array(3, 5, 7)).avg().run(conn);
Example: What’s the average number of points scored in a game?
r.table("games").avg("points").run(conn);
Example: What’s the average number of points scored in a game, counting bonus points?
r.table("games").avg(
game -> game.g("points").add(game.g("bonus_points"))
).run(conn);
Example: What’s the average number of points scored in a game? (But return null instead of raising an error if there are no games where points have been scored.)
r.table("games").avg("points").default_(null).run(conn);
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