Re: replotting in-line data and autoscaling

[sfeam <sf...@us...>]

On Thursday, 26 April 2018 22:39:38 Dima Kogan wrote:
> 
> sfeam <sf...@us...> writes:
> 
> > I have a strong aversion to complicated last-minute changes before a
> > release. If there's some stupid error in the logic because of log
> > scaling that might have a trivial fix. But re-doing the way autoscale
> > + replot works sounds like a major change that I'd want to have tested
> > in the development version for a while before it went into a minor
> > level release.
> 
> OK. Yes. Let's then talk about it separated from this release.

Heh.  And indeed I found a stupid error that failed to check for
logscaling at one point during the "refresh" command that is substituted
for "replot" for inline data.  I make no guarantee that it fixes
everything but it does work on your test script. 

The larger routine that this error is embedded in all looks suspect
to me, but changing the whole thing is more than I'm going to tackle
right now.

Can you test the stupid-error fix using git tip for the development version?
I'll run some additional tests here also.  If nothing bad turns up I'll make
a decision about including it in 5.2.3 also.

	Ethan


> 
> 
> > I agree this is undesirable, but I don't see an immediate fix.
> > There are at least a couple of work-arounds however
> >
> > 1) Don't replot in-line data.  That didn't use to be possible at
> >    all and as you have found the change to allow it was imperfect.
> >    Put the data in a datablock instead.
> >
> > 2) Use writeback/restore:
> > 	set xrange [*:*] writeback
> > 	plot '-'
> > 	...
> > 	set xrange restore
> > 	replot
> 
> Neither of these work for me. 99% of my (quite heavy) gnuplot usage is
> via this frontend: https://github.com/dkogan/feedgnuplot
> 
> It'd be great if we supported this sort of interface natively, but
> that's a separate (and bigger) conversation. Inline data is a core
> assumption of this tool. And since the window manager is doing the
> replotting, I'm not explicitly sending the "replot" command, so I can't
> explicitly ask gnuplot to save/restore the writeback.
> 
> The earlier discussion was this:
> 
>   https://sourceforge.net/p/gnuplot/bugs/1947/
> 
> The suggestion was:
> 
>   when plotting:
>     if( we have only inline data)
>     {
>       save writeback
>     }
> 
>   when replotting:
>     if( we have only inline data &&
>         current plot ranges are those
>         computed from the autoranging )
>     {
>       restore writeback
>     }
> 
> This assumes the data doesn't change for the replot, which is true in
> the case of inline data. This actually makes replotting inline data is
> easier than data in a file.
> 
> Do you see downsides here?
> 
> Thanks.
> 
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