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From: Karl Ratzsch <mail.kfr@gmx.net>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: can I fit two columns when I use timefmt
Date: Wed, 25 Oct 2017 09:18:27 +0200
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Am 25.10.2017 um 08:10 schrieb Jean-Pierre Coulon:
> On Tue, 24 Oct 2017, Karl Ratzsch wrote:
> 
>> You have a datafile with columns t, p(t), q(t), right?
> 
> My datafile contains these columns: 1: time in seconds, integer 2:
> time in %y%m%d_%Hh%Mm%Ss format 3: p(t) 4: q(t) I am happy with my
> plots using 2:3 or 2:4 with timefmt = this format. And I am able to
> select an xrange by putting my 2 limits in this format in the set
> xrange statement.
> 

Ah. That's imo not what you initially described (see your first
post). Nevermind.

>> Now what does model(x) describe?
> 
> p(t) = a*q(t) + b
> 
> and it works if I say fit model(x) datafile using 4:3 via a b.
> 
> How can I limit the range to the last two thirds of my datafile? My
> columns 3 and 4 are not monotonic.

So you want to correlate columns 3 and 4, but limit the range
according to column 1 (or 2) ? Got it.

You can

   fit model(x) dataf  us 3:($1<start?NaN:$1>end?NaN:$4) via a,b

, that just reads in NaN for any line where $1 is out of range. You
might use "stats" to set the range limiters.

  Karl