+1 Nadav
-----הודעה מקורית----- מאת: [EMAIL PROTECTED] בשם Timothy Hochberg נשלח: ה 24-אפריל-08 04:16 אל: Discussion of Numerical Python נושא: Re: [Numpy-discussion] numpy release [CHOP] The proposals thus far don't address two of the major issues I have with the matrix class: 1. The matrices and arrays should become more alike if possible and should share more of the same code base. From what I've seen, the people who write the code (for numpy) don't actually use matrices, they use the arrays. This is one of the main reasons matrices still have so many problems IMO; if one of the main developers were using them, they'd never have put up with it. This may be changing to some extent now, but the more we can make matrices and arrays share code and interface, the happier we'll be. None of the new rules strike me as helping in this arena and may in fact hurt. Again, IMO. 2. This doesn't support the concept of arrays of matrices/vectors, which is one thing I've always wanted out of the matrix class. For example it would be nice to be able to spell: 'A' is a 1D array of matrices (3D) overall, 'B' is a 1D array of vectors (3D) overall, matrix multiply them together, yielding a 1D array of matrices (3D) overall. I have frequently run into various permutations of this problem. You can fake it with loops over dot, but the efficiency is very bad for small arrays, plus it's ugly. I have lot's of vague ideas on this subject that have been floating around my head for the past couple of years. Basically, I think the way to go is to probably add some meta information to arrays that make them look a little bit more like tensors. Then, if one is careful (and things work out as I hope) matrices could be implemented as a thin layer on top of arrays. Or perhaps, if we are very lucky, done away with altogether. Anyway, that's all very vague and hand-wavey; if I can spring free some time, I'll try to write something up in the not too distant future. I'm glad to see that any major changes are being put off for a while: I think we should be able to do better than just patch up the old matrix class. -tim
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