in lib/analysis.py [0:0]
def calc_histogram_density(counts, n):
density = []
cdf = []
cum = 0
for i in range(len(counts)):
density.append(float(counts[i]/n))
cum = cum+counts[i]
cdf.append(float(cum))
cdf = [x / cum for x in cdf]
return [density, cdf]