TDIGEST.BYRANK 

TDIGEST.BYRANK key rank [rank ...]
Available in:
Redis Open Source / Bloom 2.4.0
Time complexity:
O(1)
ACL categories:
@tdigest, @read,
Compatibility:
Redis Enterprise and Redis Cloud compatibility

Returns, for each input rank, a floating-point estimation of the value with that rank. Multiple estimations can be retrieved in a single call.

Required arguments

key

is the key name of an existing t-digest sketch.

rank

Ranks for which the values 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, where n denotes the number of observations that have been added to the sketch.

Example 

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"

Redis Enterprise and Redis Cloud compatibility

Redis
Enterprise		 Redis
Cloud		 Notes
✅ Supported
 ✅ Flexible & Annual
✅ Free & Fixed

Return information

One of the following:

  • Array of bulk strings as floating-points, populated with value_1, value_2, ..., value_R:
    • an accurate result when rank is 0, the value of the smallest observation.
    • 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.
    • inf when rank is equal to n or larger than n.
    • nan for all ranks when the given sketch is empty.
  • Simple error reply in these cases: the given key does not exist or is of an incorrect type, rank parsing errors, or incorrect number of arguments.
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