[PYTHON MATRIX-SIG] Re: Pseudo Indices

Hinsen Konrad hinsenk@ere.umontreal.ca
Tue, 30 Jan 1996 14:21:11 -0500

   In order to make such code easier to read, Yorick introduces the
   notion of a pseudo index that can be added to any multidimensional index
   and means, add a new dimension here.

   ie. b[2, PseudoIndex] <--> b.reshape(2, 1)

Not quite. "2" means "the third element".

   "All" is not in fact related to Yorick pseudo indices at all, but is
   related to Slices.

But "All" is the equivalent of the Yorick pseudoindex *, which of
course is also a special form of a slice.

   c = array([[1,2,3], [11,12,13]])

   I'd really like to be able to say c[:, 3] -> array([3,13]).  Python

Small correction: c[:, 2].

   In Yorick that would look like a[.., 3].  Since Python doesn't yet
   have this rubber index, I use the following:

   a[RubberIndex, 3].

That should also get a better name... I think I already made
some proposals, I just have to dig that message out again...

Konrad Hinsen                     | E-Mail: hinsenk@ere.umontreal.ca
Departement de chimie             | Tel.: +1-514-343-6111 ext. 3953
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