[MATRIX-SIG] Possible bug in Numeric LoadArray function

Konrad Hinsen hinsen@ibs.ibs.fr
Thu, 8 Jan 1998 12:30:31 +0100

> A pickled file for an integer array was created on an SGI Onyx.
> This machine has 4 byte ints and 4 byte longs.
> The picked file would not read on a DEC alpha (64 bit longs).
> The reshape function in LoadArray failed because the
> byte counts didn't match.

I am not surprised - the pickling approach used in NumPy is not really
portable. Anyway, it will have to be rewritten to profit from cPickle
under Python 1.5. Unfortunately, there is no perfect solution; either
pickling must make assumptions about the binary format of its data
types (as it does now), or it must apply a conversion, which can
become very time consuming for large arrays.
Konrad Hinsen                          | E-Mail: hinsen@ibs.ibs.fr
Laboratoire de Dynamique Moleculaire   | Tel.: +33-
Institut de Biologie Structurale       | Fax:  +33-
41, av. des Martyrs                    | Deutsch/Esperanto/English/
38027 Grenoble Cedex 1, France         | Nederlands/Francais

MATRIX-SIG  - SIG on Matrix Math for Python

send messages to: matrix-sig@python.org
administrivia to: matrix-sig-request@python.org