en PL/Python

CREATE OR REPLACE FUNCTION py_numeric_median(_numeric) RETURNS text AS
$$
	import numpy
#	t = eval(args[0].replace("{","[").replace("}","]"))
	t = args[0].replace("{","").replace("}","").split(",")
 
	t1 = []
	for v in t:
		t1.append(float(v))
	return numpy.median(t1)
$$ LANGUAGE 'plpythonu';