Path: csiph.com!eternal-september.org!feeder.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail
From: =?UTF-8?Q?J=c3=b6rg_Buchholz?= <bookwood4new@freenet.de>
Newsgroups: comp.graphics.apps.gnuplot
Subject: Re: can I fit two columns when I use timefmt
Date: Tue, 24 Oct 2017 14:19:32 +0200
Organization: A noiseless patient Spider
Lines: 23
Message-ID: <osnb4k$qib$1@dont-email.me>
References: <alpine.WNT.2.20.1710241324490.5548@dhcp3-6>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: 8bit
Injection-Date: Tue, 24 Oct 2017 12:19:32 -0000 (UTC)
Injection-Info: reader02.eternal-september.org; posting-host="f73ca1237ee9a2cb5c51a2452083d758"; logging-data="27211"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX18cD2PErlDTE7eHLLKW1mgZ6cGbtnhJnoQ="
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.4.0
In-Reply-To: <alpine.WNT.2.20.1710241324490.5548@dhcp3-6>
Content-Language: en-GB
Cancel-Lock: sha1:OZoARwnTQjAfH/hw2kkEvg3s9ZQ=
Xref: csiph.com comp.graphics.apps.gnuplot:3789

On 24.10.2017 13:30, Jean-Pierre Coulon wrote:
> 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"

You plot value2 and value3 by using value1 (your time data) as x value?

plot 'datafile' u 1:2, '' u 1:3

> 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

Here you use value2 as xdata and they don't have a timeformat.

> What is the right way to do?

Before fitting 2:3 unset xdata time by using

set xdata

Jörg