[Numpy-discussion] Is apply_over_axes working for np.ma function?

Chao YUE chaoyuejoy@gmail....
Thu Nov 22 15:13:18 CST 2012


I am using version 1.6.2

In [77]: np.__version__
Out[77]: '1.6.2'


On Thu, Nov 22, 2012 at 10:08 PM, Chao YUE <chaoyuejoy@gmail.com> wrote:

> Dear all,
>
> I tried the np.apply_over_axes and np.ma.apply_over_axes, it seems that
> they are not working for the masked array?
> I searched the wiki and there are two tickets (1480,8417) related with
> this, it seems that it's a solved issue?
>
> the example is below:
>
> In [67]: a = np.arange(60.).reshape(3,4,5)
>
> In [68]: tempm = np.tile(np.array([True,True,False,False,False]),(3,4,1))
>
> In [69]: b = np.ma.masked_array(a,mask=tempm)
>
> In [70]: np.apply_over_axes(np.ma.sum,a,[1,2])
> Out[70]:
> array([[[ 190.]],
>
>        [[ 590.]],
>
>        [[ 990.]]])
>
> In [71]: np.ma.sum(np.ma.sum(a,axis=1),axis=1)
> Out[71]: array([ 190.,  590.,  990.])
>
> In [72]: np.ma.sum(np.ma.sum(b,axis=1),axis=1)
> Out[72]:
> masked_array(data = [126.0 366.0 606.0],
>              mask = [False False False],
>        fill_value = 1e+20)
>
>
> In [73]: np.apply_over_axes(np.ma.sum,b,[1,2])
> Out[73]:
> array([[[ 190.]],
>
>        [[ 590.]],
>
>        [[ 990.]]])
>
> In [74]: np.apply_over_axes(np.sum,b,[1,2])
> Out[74]:
> array([[[ 190.]],
>
>        [[ 590.]],
>
>        [[ 990.]]])
>
> In [75]: np.ma.apply_over_axes(np.sum,b,[1,2])
> Out[75]:
> array([[[ 190.]],
>
>        [[ 590.]],
>
>        [[ 990.]]])
>
> In [76]: np.ma.apply_over_axes(np.ma.sum,b,[1,2])
> Out[76]:
> array([[[ 190.]],
>
>        [[ 590.]],
>
>        [[ 990.]]])
>
>
> thanks,
>
> 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
>
> ************************************************************************************
>
>


-- 
***********************************************************************************
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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