[Octave-bug-tracker] [bug #35292] FLTK plot figure crashes when using right-mouse zoom and logarithmic axes

[Doug Stewart]

Follow-up Comment #18, bug #35292 (project octave):

in graphics.cc in the area of line 5949 we have

if (is_logscale && ! (xisinf (hi) || xisinf (lo)))
    {
      // FIXME - what if (hi-lo) < tick_sep?
      //         ex: loglog ([1 1.1])
      tick_sep = std::max (tick_sep, 1.);
      tick_sep = std::ceil (tick_sep);
    }
farther down we have:
 Matrix tmp_mticks (1, n * (tmp_ticks.numel () - 1));
when it crashes tmp_ticks.numel ()  is zero
and therefore it tries to make an array with dim (1,-7).

It seem to be when the x range is less than 1 log cycle
so the fixme  likely needs fixing.

I will look at it more, but just wanted to document where the problem is.


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