[Numpy-discussion] array not appending
Alan G Isaac
aisaac@american....
Thu Dec 18 08:05:03 CST 2008
On 12/18/2008 5:56 AM Prashant Saxena apparently wrote:
> ST = np.empty((), dtype=np.float32)
> ST = np.append(ST, 10.0)
If you really need to append elements,
you probably want to use a list and
then convert to an array afterwards.
But if you know your array size,
you can preallocate memory and then fill it.
E.g.,
>>> ST = np.empty((10,),dtype=np.float32)
>>> for i in range(10): ST[i]=i
hth,
Alan Isaac
PS Some users suggest it is better practices
to use `zeros` rather than `empty`. Note that
`zeros` has the same property that surprised you.
>>> np.zeros((),dtype=np.float32)
array(0.0, dtype=float32)
>>> np.append(np.zeros((),dtype=np.float32),99)
array([ 0., 99.])
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