[Numpy-discussion] Question regarding concatenate/vstack.
andrew nelson
andyfaff@gmail....
Wed Mar 30 05:30:46 CDT 2011
Dear List,
I have a quick question regarding vstack and concatenate.
In the docs for vstack it says that:
np.concatenate(tup, axis=0)
should be equivalent to:
np.vstack(tup)
However, I tried this out and it doesn't seem to be case, i.e.
>>> np.vstack((np.arange(5.), np.arange(5.)))
array([[ 0., 1., 2., 3., 4.],
[ 0., 1., 2., 3., 4.]])
>>> np.concatenate((np.arange(5.),np.arange(5.)), axis=0)
array([ 0., 1., 2., 3., 4., 0., 1., 2., 3., 4.])
These aren't the same. Maybe I'm missing something?
regards,
Andrew.
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