[PYTHON MATRIX-SIG] Empty matrix implementation references

[Konrad Hinsen]

   n-dimensional arrays, n>=1, by adding missing dimensions to arrays as
   usual. For example, if a.shape=(0,n), it should probably behave as if
   a.shape=(1,1,0,n), when involved in an operation with a (possibly
   empty) 4-d array. This doesn't seem to conflict with the present
   handling of 0-d arrays (scalars), either.

Any good book on APL2 contains a detailed discussion on empty arrays
in complicated cases. Empty arrays are not just a curiosity, but an essential
part of APL-style programming.

Konrad.

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