Many thanks for useful hints. Some questions to them:
1) Where is a list of constructor options for carray, I could not find it in
the document you referenced.
2) Will the "decent value" when chunk size is not specified handle properly
a case where my matrix is ordered like fortran (column-wise)?
Thanks a lot,
Dominik
On Mon, Jan 3, 2011 at 5:48 PM, Francesc Alted <fal...@pytables.org> wrote:
> Hi Dominik,
>
> 2011/1/3, Dominik Szczerba <domi...@itis.ethz.ch>:
> > Hi,
> >
> > I could not find a clear example how to create a compressed dataset.
> Could
> > someone please point me in the right direction?
> > Let's say I want to do something as simple as the below, only compressing
> > the data using zlib, when required defining 1e6 chunk size.
> >
> > f = tables.openFile(fname,"w")
> > f.createArray(f.root,"u",u)
> > f.createArray(f.root,"v",v)
> > f.createArray(f.root,"w",w)
> > f.close()
>
> Array objects are non-chunked. In order to use compression, you need
> to use a CArray:
>
> http://www.pytables.org/docs/manual/ch04.html#CArrayClassDescr
>
> or an EArray (objects enlargeable on a certain dimension):
>
> http://www.pytables.org/docs/manual/ch04.html#EArrayClassDescr
>
> For choosing the desired chunksize, make use of the `chunkshape`
> attribute in constructors (if not specified, a decent default will be
> automatically chosen for you).
>
> HTH,
>
> --
> Francesc Alted
>
>
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