Re: [Pytables-users] subarray extraction and update

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

Alle 16:44, luned=EC 25 luglio 2005, Bernard KAPLAN ha scritto:
> Dear Antonio,
>
> In hdf5 you can define progressively a selected region (adding elements
> one by one) by use of either "H5Sselect_elements" with H5S_SELECT_APPEN=
D
> or "H5Sselect_hyperslab" with H5S_SELECT_OR. Then you can read or write
> the selected elements at once with "H5Dread" or "H5Dwrite".

Yes, you are right. The selection operation is not as immediate as in you=
r=20
example, but afrer selection you can read all data at once.

> Is there a function in pytables that use this functionality ? How would
> you do to extract a submatrix in pytables ?

I think that at the moment this functionality is not available. Surely=20
Francesk or Ivan can give you more explainations.
Usually I get an entire block of data from arrays=20

data =3D h5f.myarray[0:100, 0:100]

I never encountered a situation like yours, sorry :((

> Bernard||
>
> Antonio Valentino wrote:
> >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 pytable=
s 2-d
> >>array
> >>data[x,y]=3D0   # set the submatrix defined by x rows and y columns t=
o 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 an=
other

[...]

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--=20
Antonio Valentino