#!/usr/bin/env python

import math
import numpy as np

def sd1(rr):
	sdnn = np.std(rr)
	return math.sqrt(0.5 * sdnn * sdnn)
[((7, 8, 7, 18), 'numpy.std', 'np.std', ({(7, 15, 7, 17): 'rr'}, {}), '(rr)', True, 'import numpy as np\n'), ((8, 8, 8, 36), 'math.sqrt', 'math.sqrt', ({(8, 18, 8, 35): '(0.5 * sdnn * sdnn)'}, {}), '(0.5 * sdnn * sdnn)', False, 'import math\n')]