[Numpy-discussion] type-casting inconsistency with timedelta64

Benjamin Root ben.root at ou.edu
Fri Sep 16 16:28:18 EDT 2011

Came across an oddity when experimenting with the datetime64 and timedelta64

a = np.zeros((10,), dtype='l')
b = np.datetime64('2010-12-20T14:23:56-0600')
c = np.datetime64('2010-12-20T21:27:09-0600')

a[0:1] = c - b   # This works fine
a[0] = c - b     # This does not

The second assignment throws the following error:
TypeError: don't know how to convert scalar number to long

Ben Root

P.S. - np.arange() can make ranges of datetime64 from string inputs, but
np.linspace() can not (and does not take a dtype kwarg).
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