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 ------------------------------------------------------------------------------ Learn how Oracle Real Application Clusters (RAC) One Node allows customers to consolidate database storage, standardize their database environment, and, should the need arise, upgrade to a full multi-node Oracle RAC database without downtime or disruption http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Pytables-users mailing list Pytables-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pytables-users
