easy way to collapse the last two dimension of an array?
Dear all, I have an array with 4 dim: In [24]: dd.shape Out[24]: (12, 13, 120, 170) I would like to collapse the last two dim for applying np.sum(axis=-1) In [25]: dd.reshape(12,13,-1).shape Out[25]: (12, 13, 20400) is there a more general way to do this? something like In [21]: dd.reshape(*dd.shape[0:2],-1).shape ------------------------------------------------------------ File "<ipython console>", line 1 SyntaxError: only named arguments may follow *expression (<ipython console>, line 1) thanks a lot for any hints, cheers, Chao -- *********************************************************************************** Chao YUE Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) UMR 1572 CEA-CNRS-UVSQ Batiment 712 - Pe 119 91191 GIF Sur YVETTE Cedex Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16 ************************************************************************************
On Mon, Jun 3, 2013 at 9:44 AM, Chao YUE
Dear all,
I have an array with 4 dim:
In [24]: dd.shape Out[24]: (12, 13, 120, 170)
I would like to collapse the last two dim for applying np.sum(axis=-1)
In [25]: dd.reshape(12,13,-1).shape Out[25]: (12, 13, 20400)
is there a more general way to do this? something like In [21]: dd.reshape(*dd.shape[0:2],-1).shape ------------------------------------------------------------ File "<ipython console>", line 1 SyntaxError: only named arguments may follow *expression (<ipython console>, line 1)
dd.reshape(dd.shape[:-2] + (-1,)) -- Robert Kern
On Mon, 2013-06-03 at 10:44 +0200, Chao YUE wrote:
Dear all,
I have an array with 4 dim:
In [24]: dd.shape Out[24]: (12, 13, 120, 170)
I would like to collapse the last two dim for applying np.sum(axis=-1)
If you use Numpy >= 1.7. you can also just use dd.sum(axis=(-1,-2)) - Sebastian
In [25]: dd.reshape(12,13,-1).shape Out[25]: (12, 13, 20400)
is there a more general way to do this? something like In [21]: dd.reshape(*dd.shape[0:2],-1).shape ------------------------------------------------------------ File "<ipython console>", line 1 SyntaxError: only named arguments may follow *expression (<ipython console>, line 1)
thanks a lot for any hints,
cheers,
Chao
-- *********************************************************************************** Chao YUE Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) UMR 1572 CEA-CNRS-UVSQ Batiment 712 - Pe 119 91191 GIF Sur YVETTE Cedex Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16
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Thanks to the two of you!!
Chao
On Mon, Jun 3, 2013 at 11:53 AM, Sebastian Berg
On Mon, 2013-06-03 at 10:44 +0200, Chao YUE wrote:
Dear all,
I have an array with 4 dim:
In [24]: dd.shape Out[24]: (12, 13, 120, 170)
I would like to collapse the last two dim for applying np.sum(axis=-1)
If you use Numpy >= 1.7. you can also just use dd.sum(axis=(-1,-2))
- Sebastian
In [25]: dd.reshape(12,13,-1).shape Out[25]: (12, 13, 20400)
is there a more general way to do this? something like In [21]: dd.reshape(*dd.shape[0:2],-1).shape ------------------------------------------------------------ File "<ipython console>", line 1 SyntaxError: only named arguments may follow *expression (<ipython console>, line 1)
thanks a lot for any hints,
cheers,
Chao
--
***********************************************************************************
Chao YUE Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) UMR 1572 CEA-CNRS-UVSQ Batiment 712 - Pe 119 91191 GIF Sur YVETTE Cedex Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16
************************************************************************************
_______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
_______________________________________________ NumPy-Discussion mailing list NumPy-Discussion@scipy.org http://mail.scipy.org/mailman/listinfo/numpy-discussion
-- *********************************************************************************** Chao YUE Laboratoire des Sciences du Climat et de l'Environnement (LSCE-IPSL) UMR 1572 CEA-CNRS-UVSQ Batiment 712 - Pe 119 91191 GIF Sur YVETTE Cedex Tel: (33) 01 69 08 29 02; Fax:01.69.08.77.16 ************************************************************************************
participants (3)
-
Chao YUE -
Robert Kern -
Sebastian Berg