TDIGEST.BYRANK
Syntax
TDIGEST.BYRANK key rank [rank ...]
- Available in:
- Redis Stack / Bloom 2.4.0
- Time complexity:
- O(N) where N is the number of ranks specified.
Returns, for each input rank, an estimation of the value (floating-point) with that rank.
Multiple estimations can be retrieved in a signle call.
Required arguments
key
is key name for an existing t-digest sketch.
rank
Rank, for which the value should be retrieved.
0 is the rank of the value of the smallest observation.
n-1 is the rank of the value of the largest 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
rank
is 0 (the value of the smallest observation) - Return an accurate result when
rank
is n-1 (the value of the largest observation), where n denotes the number of observations added to the sketch. - Return 'inf' when
rank
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.BYRANK t 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
1) "1"
2) "2"
3) "2"
4) "3"
5) "3"
6) "3"
7) "4"
8) "4"
9) "4"
10) "4"
11) "5"
12) "5"
13) "5"
14) "5"
15) "5"
16) "inf"