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added tests improved func

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This commit is contained in:
Andy Eschbacher
2015-05-14 15:32:58 -04:00
parent dcd35fc3d7
commit 16d0dc739a
3 changed files with 19 additions and 6 deletions
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13
scripts-available/CDB_EqualIntervalBins.sql
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@@ -11,26 +11,27 @@
--
--
CREATE OR REPLACE FUNCTION CDB_EqualIntervalBins ( in_array NUMERIC[], breaks INT) RETURNS NUMERIC[] as $$
CREATE OR REPLACE FUNCTION CDB_EqualIntervalBins ( in_array NUMERIC[], breaks INT ) RETURNS NUMERIC[] as $$
DECLARE
diff numeric;
min_val numeric;
max_val numeric;
tmp_val numeric;
i INT := 1;
reply numeric[];
BEGIN
SELECT (max(e) - min(e)) / breaks::numeric, min(e) INTO diff, min_val FROM (SELECT unnest(in_array) e) x WHERE e is not null;
RAISE NOTICE 'diff = %, min_val = %', diff, min_val;
SELECT min(e), max(e) INTO min_val, max_val FROM ( SELECT unnest(in_array) e ) x WHERE e IS NOT NULL;
diff = (max_val - min_val) / breaks::numeric;
LOOP
IF i < breaks + 1 THEN
IF i < breaks THEN
tmp_val = min_val + i::numeric * diff;
RAISE NOTICE 'tmp_val = %', tmp_val;
reply = array_append(reply, tmp_val);
i := i+1;
ELSE
reply = array_append(reply, max_val);
EXIT;
END IF;
END LOOP;
RETURN reply;
END;
END;
$$ language plpgsql IMMUTABLE;