TDIGEST.BYREVRANK
Syntax
TDIGEST.BYREVRANK key reverse_rank [reverse_rank ...]
- Available in:
- Redis Stack / Bloom 2.4.0
- Time complexity:
- O(1)
Returns, for each input reverse rank, an estimation of the value (floating-point) with that reverse rank.
Multiple estimations can be retrieved in a signle call.
Required arguments
key
is key name for an existing t-digest sketch.
revrank
Reverse rank, for which the value should be retrieved.
0 is the reverse rank of the value of the largest observation.
n-1 is the reverse rank of the value of the smallest observation; n denotes the number of observations added to the sketch.
Return value
Array reply - an array of floating-points populated with value_1, value_2, ..., value_R:
- Return an accurate result when
revrank
is 0 (the value of the largest observation) - Return an accurate result when
revrank
is n-1 (the value of the smallest observation), where n denotes the number of observations added to the sketch. - Return '-inf' when
revrank
is equal to n or larger than n
All values are 'nan' if the sketch is empty.
Examples
redis> TDIGEST.CREATE t COMPRESSION 1000
OK
redis> TDIGEST.ADD t 1 2 2 3 3 3 4 4 4 4 5 5 5 5 5
OK
redis> TDIGEST.BYREVRANK t 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1) "5"
2) "5"
3) "5"
4) "5"
5) "5"
6) "4"
7) "4"
8) "4"
9) "4"
10) "3"
11) "3"
12) "3"
13) "2"
14) "2"
15) "1"
16) "-inf"