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# cogent.maths.stats.alpha_diversity.observed_species

All Samples(6)  |  Call(4)  |  Derive(0)  |  Import(2)

```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_observed_species(self):
"""observed_species should return # observed species"""
c = array([4,3,4,0,1,0,2])
obs = observed_species(c)
exp = 5
self.assertEqual(obs, exp)
c = array([0,0,0])
obs = observed_species(c)
```

```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_observed_species(self):
"""observed_species should return # observed species"""
c = array([4,3,4,0,1,0,2])
obs = observed_species(c)
exp = 5
self.assertEqual(obs, exp)
c = array([0,0,0])
obs = observed_species(c)
```