19 lines
559 B
PL/PgSQL
19 lines
559 B
PL/PgSQL
--
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-- Determine the Quantile classifications from a numeric array
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--
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-- @param in_array A numeric array of numbers to determine the best
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-- bins based on the Quantile method.
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--
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-- @param breaks The number of bins you want to find.
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--
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--
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CREATE OR REPLACE FUNCTION CDB_QuantileBins(in_array numeric[], breaks int)
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RETURNS numeric[]
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AS $$
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SELECT
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percentile_disc(Array(SELECT generate_series(1, breaks) / breaks::numeric))
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WITHIN GROUP (ORDER BY x ASC) AS p
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FROM
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unnest(in_array) AS x;
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$$ language SQL IMMUTABLE STRICT PARALLEL SAFE;
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