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Re: can I fit two columns when I use timefmt

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Date	Wed, 25 Oct 2017 08:10:52 +0200
From	Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr>
Subject	Re: can I fit two columns when I use timefmt
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On Tue, 24 Oct 2017, Karl Ratzsch wrote:

> Am 24.10.2017 um 15:13 schrieb Jean-Pierre Coulon:
>>
>> Thanks. It works if I also say unset xrange. In this case I also have a first
>> column in simple integers and the 2nd column is in time format. I was plotting
>> with using 2:<other column>. Does Gnuplot use this 1srt column for the fit
>> if I say fit using <two other columns> ?
>
> No, it does only use the specified columns. But your naming scheme in
> not clear to me.
>
> 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.

> 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.
-- 
Jean-Pierre Coulon

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Thread

can I fit two columns when I use timefmt Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr> - 2017-10-24 13:30 +0200
  Re: can I fit two columns when I use timefmt Jörg Buchholz <bookwood4new@freenet.de> - 2017-10-24 14:19 +0200
    Re: can I fit two columns when I use timefmt Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr> - 2017-10-24 15:13 +0200
      Re: can I fit two columns when I use timefmt Karl Ratzsch <mail.kfr@gmx.net> - 2017-10-24 16:04 +0200
        Re: can I fit two columns when I use timefmt Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr> - 2017-10-25 08:10 +0200
          Re: can I fit two columns when I use timefmt Karl Ratzsch <mail.kfr@gmx.net> - 2017-10-25 09:18 +0200
            Re: can I fit two columns when I use timefmt Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr> - 2017-10-25 14:35 +0200
      Re: can I fit two columns when I use timefmt Jörg Buchholz <bookwood4new@freenet.de> - 2017-10-25 07:43 +0200
  Re: can I fit two columns when I use timefmt Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2017-10-25 01:01 +0200

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