Re: [Pytables-users] subarray extraction and update

[Antonio V. <val...@co...>]

Alle 11:36, luned=EC 25 luglio 2005, Bernard KAPLAN ha scritto:
> Dear all,

hi Bernard

[...]

> x=3Darray([1,2,5,8])   # row index
> y=3Darray([0,3,7])   # column index
> a=3Ddata[x,y]   # returns an array of size [4,3], 'data' is a pytables =
2-d
> array
> data[x,y]=3D0   # set the submatrix defined by x rows and y columns to =
0
> data[x,y]=3Drand([4,3])  # update of a submatrix
> data[x,y]=3Ddata2[x,y]   # copy of a submatrix from one array into anot=
her

I think that what you are asking for can't be done in an "elegant" way.
HDF5 supports hyperslabs selection that is powerfull and elegant but it=20
requires reqular spacing in the selection, see=20

http://hdf.ncsa.uiuc.edu/HDF5/doc/RM_H5S.html#Dataspace-SelectHyperslab

In order to use hyperslabs you have to be able to express the sub-matrix=20
selection in terms of "start, stride, count, and block".
It seems to me that it is not your case.

> Sincerely,
>
> Bernard KAPLAN
>
>
>
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ciao

--=20
Antonio Valentino