Dear list,
I just updated my python from 2.5.4 to 2.6.2, having to upgrade
Pytables as well, to 2.1.2. Under windows, when creating
a file which when created with 2.5.4 I had been able to open using
Igor pro 5, suddenly was inopenable using Igor.
I realized that Pytables (I downloaded the binary from the
website) is now compiled with 1.8.3, while it was compiled with
1.6.something before. Apparently, the new version of
pytables or hdf5 or both combined apparently use new features
that are incompatible with older versions of Hdf5.
For simplicity, I tested all that with a little script:
----------- snip -----------------------
from tables import *
from numpy import *
a=openFile("a.h5", "w")
g=a.createGroup("/", "g", "bla")
ar=a.createArray(g, "ar", arange(1000))
a.close()
----------- snip -----------------------
and indeed, with 2.5.4/2.something/1.6.something I'm left with
a file of 8096 bytes, while 2.6.2/2.1.2/1.8.3 leaves me with
6904 bytes. When dumped with h5dump, the two files are
identical.
Under Linux, where I have a 2.6.2/2.1.1/1.6.6 installation,
I get the good-old 8096 bytes, and Igor is able to open nicely.
(Little note on the side: If the file is created with 2.6.2/2.1.1/1.8.2
under windows, Igor crashes when reading the file...)
So, I guess we have to convince HDF5 to use an old file format,
(maybe using H5Pset_libver_bounds?)
Yours
Martin Teichmann
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