A Thursday 23 July 2009 22:29:31 nicky van foreest escrigué: > Hi, > > I would like to include a vl array in a class like this (from the > tutorial): > > class Particle(IsDescription): > name = StringCol(itemsize=16) # 16-character string > lati = Int32Col() # integer > longi = Int32Col() # integer > pressure = Float32Col(shape=(2,3)) # array of floats > (single-precision) temperature = Float64Col(shape=(2,3)) # array of doubles > (double-precision) > > > Is it possible to make, for instance, temperature a variable length > array? The following doesn't work, which I concocted by analogy with > vlarray1.py: > > class Particle(IsDescription): > name = StringCol(16) # 16-character String > temperature = Int32Atom(shape=())
No, variable length records in Table objects are not supported, and probably will never be so because of efficiency reasons (accessing to regular rectangular block sizes is way faster than accessing to ragged ones). However, you can always simulate 'variable-length' records by keeping an index in the table to the row of the VLArray that contains you variable length field (or fields). Hope that helps, -- Francesc Alted ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Pytables-users mailing list Pytables-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/pytables-users
