[Octave-bug-tracker] [bug #51880] sparse() ignores value of scalar column index input arg

[John W. Eaton]

Follow-up Comment #2, bug #51880 (project octave):

If I understand correctly, the xcidx vector has length nc+1 and with this
code, if the specified column is less than nc, then the remaining elements
would be uninitialized.  Is that OK?

Also, is there any check to ensure that c(0) > 0?  Maybe it can't be less than
zero since it is supposed to be an element of an index vector?

Anyway, I came up with this instead:


  xcidx (0) = 0;
  for (octave_idx_type j = 0; j < nc; j++)
    xcidx (j+1) = j >= c(0) ? new_nz : 0;


but I don't know whether it is correct to set all the remaining xcidx elements
to new_nz.

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