[Numpy-discussion] array of random numbers fails to construct

Allan Haldane allanhaldane at gmail.com
Tue Dec 8 20:01:19 EST 2015


On 12/08/2015 07:40 PM, Stephan Hoyer wrote:
> On Sun, Dec 6, 2015 at 3:55 PM, Allan Haldane <allanhaldane at gmail.com
> <mailto:allanhaldane at gmail.com>> wrote:
> 
> 
>     I've also often wanted to generate large datasets of random uint8
>     and uint16. As a workaround, this is something I have used:
> 
>     np.ndarray(100, 'u1', np.random.bytes(100))
> 
>     It has also crossed my mind that np.random.randint and
>     np.random.rand could use an extra 'dtype' keyword. It didn't look
>     easy to implement though.
> 
>  
> Another workaround that avoids creating a copy is to use the view
> method, e.g.,
> np.random.randint(np.iinfo(int).min, np.iinfo(int).max,
> size=(1,)).view(np.uint8)  # creates 8 random bytes

Just to note, the line I pasted doesn't copy either, according to the
OWNDATA flag.

Cheers,
Allan



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