Re: 5.2-stable regression for log axes still not fixed completely

[Achim G. <Str...@ne...>]

Ethan A Merritt via gnuplot-beta writes:
> That first line is not a legal command in version 5, or at any rate
> it is meaningless.

Well, that code is some years old and I haven't yet the need or
otherwise gotten around to clue it in to the fact we're no longer using
gnuplot-4.x on any installation.

> If that command is actually doing something, that's a bug all by itself.

I think not, but I've just stopped fiddling with it when I had the
reproducer down to three lines.  :-)

> On the other hand, that spurious warning is generated even without
> "reverse/noreverse" involved.  I think the actual error is that 
> set xrange [*:*] turns on autoscaling but does not erase the previous
> min/max.  Since they were both negative numbers, "set log" complains.

Yes, that sounds like a good explanation.

> The code has a special check that handles the default axis range
> setting [-10:10].  Maybe that check should be extended to cover all
> cases of negative range limits?   Not sure.  But really I think the
> problem is that "set auto" and "set range [*:*] don't actually clear
> the previous limits.  Unfortunately I suspect that the "refresh" command
> relies on that, so the best fix is not immediately clear.

I don't think I can currently help with that.  As a workaround it seems
that

unset xrange; set autoscale x

might do in our scripts, so I'm inclined to go with that for now.


Regards,
Achim.
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