sparse-xpow.cc: Improve consistency between sparse and full matrices (bug #63080) sparse-xpow.cc: Return 0x0 matrix for empty inputs of all sizes. Return early for all-zeros matrix with positive power. Add FIXME for all-zeros matrix with negative power. Add BISTs.

1; %script identifier

if (flag)
  function r = computation ()
    r = 1;
  endfunction

  r = computation ();
else
  function r = computation ()
    r = 2;
  endfunction

  r = computation ();
endif