On Mon, 2003-05-12 at 16:06, Gerard Vermeulen wrote:

Hi,

It was remarkable easy to make my plot package PyQwt for Numeric, also compatible with numarray :-)

Great! That's they way things are *supposed* to work, and usually do, but don't always.

( PyQwt is a wrapper for Qwt, a Qt-based library with widgets useful for science and engineering -- http://gerard.vermeulen.free.fr )

I discovered by accident that PyQwt compiled with #include <numarray/arrayobject.h> plots Numeric-arrays and that PyQwt compiled with #include <Numeric/arrayobject.h> plots numarray-arrays.

This part sounds a little backward. Presumably this was a typo.

The only interface between PyQwt and Numeric (or numarray) passes through PyArray_ContiguousFromObject to cast sequences into arrays from which data is copied into Qwt's data structures.

PyQwt never returns Numeric- or numarray-arrays.

Is this feature platform dependent?

Yes, if I understand your question correctly.

Or is it safe to release PyQwt, claiming that a Numeric-compiled PyQwt is compatible with numarray and vice-versa?

No dice. numarray is currently trying for source level compatibility only, so an extension compiled for Numeric creates slightly different object code than one compiled for numarray; slightly different means inoperable. Still, it's good to know that PyQwt is very close to workable for numarray.

Gerard

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