[Octave-bug-tracker] [bug #47175] “dimension too large” error when broadcasting to sparse matrix in octave

[Lachlan Andrew]

Follow-up Comment #3, bug #47175 (project octave):

Repmat already returns sparse output for sparse input.

A big weakness with the bsxfun patch is that it builds the sparse matrix
column at a time.  This will probably involve copying the entire matrix for
each row processed.  That can be avoided if we know the number of non-zero
elements in the final matrix.

Can someone suggest a good heuristic for estimating the number of non-zero
elements in the solution?  Ideally, I don't want too many special cases for
different values of
  (operator, operand1-shape/sparsity, operand2-shape/sparsity).

    _______________________________________________________

Reply to this item at:

  <http://savannah.gnu.org/bugs/?47175>

_______________________________________________
  Message sent via/by Savannah
  http://savannah.gnu.org/