RE: [Numpy-discussion] Slow conversion from list to arrays

[Nadav H. <na...@vi...>]

It works excellent. I see also that there is a corresponding update in =
the CVS.

  Happy new (and peaceful) year,
   Nadav.


-----Original Message-----
From:	Todd Miller [mailto:jm...@st...]
Sent:	Tue 30-Dec-03 16:34
To:	Nadav Horesh
Cc:	numpy-discussion
Subject:	Re: [Numpy-discussion] Slow conversion from list to arrays
On Thu, 2003-12-25 at 03:27, Nadav Horesh wrote:=20
> The conversion for a list of large arrays into a matrix is very slow =
in
> numarray while reasonably fast:
>=20
> >>> from numarray import *
> >>> a =3D [arange(200000), arange(200000), arange(200000), =
arange(200000)]
> >>> aa =3D array(a)   # Very slow
>=20
> --------------------------------
>=20
> >>> from Numeric import *
> >>> a =3D [arange(200000), arange(200000), arange(200000), =
arange(200000)]
> >>> aa =3D array(a)   # Fast
>=20
> Python version:    2.3.3
> numarray version:  Official 0.8
>=20
> Tested under WinXP and RH9 linux.
>=20
> Any workaround?
>=20
Try concatenate.  For the array sizes you're looking at,  numarray does
OK.  You may have to adjust the result shape.

Todd=20

>   Nadav
>=20
>=20
>=20
>=20
>=20
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--=20
Todd Miller 		=09
Space Telescope Science Institute
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