[PYTHON MATRIX-SIG] Empty matrix implementation references

Konrad Hinsen hinsen@physik.rwth-aachen.de
Tue, 13 Aug 1996 09:57:39 +0200

   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 Hinsen                     | E-Mail: hinsenk@ere.umontreal.ca
Departement de Chimie             | Tel.: +1-514-343-6111 ext. 3953
Universite de Montreal            | Fax:  +1-514-343-7586
C.P. 6128, succ. A                | Deutsch/Esperanto/English/Nederlands/
Montreal (QC) H3C 3J7             | Francais (phase experimentale)

MATRIX-SIG  - SIG on Matrix Math for Python

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