[Numpy-discussion] Products of small float32 values.

[Dave Cook]

Can someone explain what is going on here?

In [153]:

small = ones(1, dtype='float32')

In [154]:

small

Out[154]:

array([ 1.], dtype=float32)

In [155]:

small*1e-45

Out[155]:

array([  1.40129846e-45], dtype=float32)

In [156]:

small*1e-46

Out[156]:

array([ 0.], dtype=float32)

I would expect float32 to be able to represent
numbers with exponents as small as -127.

Thanks,
Dave Cook
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