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R.JACCARD / R64.JACCARD ​

Returns the Jaccard similarity |A∩B| / |A∪B| of two bitmaps.

SyntaxR.JACCARD key1 key2
64-bitR64.JACCARD key1 key2
Time complexityO(N)

Arguments ​

  • key1, key2 — both keys must exist

Reply ​

Bulk string under both RESP2 and RESP3, formatted as follows:

  • -1 when both bitmaps are empty, 0 when they share nothing, 1 when they are equal;
  • otherwise the exact decimal when the ratio has one within nine fractional digits (0.5, 0.125, 0.000000001);
  • otherwise C's %.17g of the ratio (0.33333333333333331, 3.3333333333333335e-05).

Example ​

bash
127.0.0.1:6379> R.JACCARD segment:a segment:b
"0.42857142857142855"