[PYTHON MATRIX-SIG] A problem with slicing

Hinsen Konrad hinsenk@ere.umontreal.ca
Fri, 15 Sep 1995 14:25:10 -0400


   Hinsen> That's nice on the left hand side of an assignment, but what
   Hinsen> is the value of a[a.gt(2)] in an expression? It can't be an
   Hinsen> array!

   It be an array if you define a selection type indexing, e.g.,
   a.select(a.gt(2))

   where select is a method that whose argument has the same
   dimensions as "a" and returns elements of "a" that correspond to
   "true" elements of a.gt(2).

But *how* does it return the elements that correspong to "true"?
Specifically, what is the shape of the array returned?

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