#!/usr/bin/env python

import math
import numpy as np

def sd1(rr):
	sdnn = np.std(rr)
	return math.sqrt(0.5 * sdnn * sdnn)
[((76, 86), 'numpy.std', 'np.std', (['rr'], {}), '(rr)\n', (82, 86), True, 'import numpy as np\n'), ((95, 123), 'math.sqrt', 'math.sqrt', (['(0.5 * sdnn * sdnn)'], {}), '(0.5 * sdnn * sdnn)\n', (104, 123), False, 'import math\n')]