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src/c/o/cogent-1.5.3/tests/test_maths/test_stats/test_alpha_diversity.py   cogent(Download)
from math import e
from cogent.util.unit_test import TestCase, main
from cogent.maths.stats.alpha_diversity import expand_counts, counts, observed_species, singles, \
    doubles, osd, margalef, menhinick, dominance, simpson, \
    simpson_reciprocal, reciprocal_simpson,\
    def test_robbins(self):
        """robbins metric should match hand-calculated value"""
        c = array([1,2,3,0,1])
        r = robbins(c)
        self.assertEqual(r,2./7) 

src/p/y/pycogent-HEAD/tests/test_maths/test_stats/test_alpha_diversity.py   pycogent(Download)
from math import e
from cogent.util.unit_test import TestCase, main
from cogent.maths.stats.alpha_diversity import expand_counts, counts, observed_species, singles, \
    doubles, osd, margalef, menhinick, dominance, simpson, \
    simpson_reciprocal, reciprocal_simpson,\
    def test_robbins(self):
        """robbins metric should match hand-calculated value"""
        c = array([1,2,3,0,1])
        r = robbins(c)
        self.assertEqual(r,2./7)