TDIGEST.QUANTILE

Syntax
TDIGEST.QUANTILE key quantile [quantile ...]
Available in:
Redis Open Source / Bloom 2.4.0
Time complexity:
O(N) where N is the number of quantiles specified.
ACL categories:
@tdigest, @read,

Returns, for each input fraction, a floating-point estimation of the value that is smaller than the given fraction of observations. Multiple quantiles can be retrieved in a single call.

Required arguments

key

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

quantile

is the input fraction between 0 and 1 inclusively.

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.QUANTILE t 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
 1) "1"
 2) "2"
 3) "3"
 4) "3"
 5) "4"
 6) "4"
 7) "4"
 8) "5"
 9) "5"
10) "5"
11) "5"

Return information

One of the following:

  • Array of bulk string replies as floating-point estimates, populated with value_1, value_2, ..., value_N.
    • an accurate result when quantile is 0, the value of the smallest observation.
    • an accurate result when quantile is 1, the value of the largest observation.
    • nan for all quantiles when the given sketch is empty.
  • Simple error reply in these cases: the given key does not exist or is of an incorrect type, quantile parsing errors, or incorrect number of arguments.
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