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can I fit two columns when I use timefmt

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Date Tue, 24 Oct 2017 13:30:29 +0200
From Jean-Pierre Coulon <coulon@cacas.pam.obs-nice.fr>
Subject can I fit two columns when I use timefmt
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I have a datafile with lines like 171023_15h11m59s150 <value2> <value3>.
I know how to plot columns 2 and 3 using set xdata time; set timefmt
"%y%m%d_%Hh%Mm%Ss"

My model is a = .028; b=.04; model(x) = a*x + b. When I say
fit modele(x) "mystuff.txt" using 2:3 via a, b I obtain: No data to fit

What is the right way to do?

Regards,
-- 
Jean-Pierre Coulon

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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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