Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news.swapon.de!fu-berlin.de!uni-berlin.de!news.dfncis.de!not-for-mail From: =?ISO-8859-1?Q?Hans-Bernhard_Br=F6ker?= Newsgroups: comp.graphics.apps.gnuplot Subject: Re: Questions about gnuplot command fit by a newbee. Date: Sun, 27 Apr 2014 17:22:50 +0200 Lines: 29 Message-ID: References: <1f95d7ab-7451-4ced-9e26-e4522737bf0a@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Trace: news.dfncis.de fDFW5Q8EG7ZmpgzPIDtY8AvmSkjXIZJxcAoM4F3XmqDrPn8MsstdbHidOs Cancel-Lock: sha1:TYYvkiBOEH9+QAzu41Qk5pUx05M= User-Agent: Mozilla/5.0 (Windows NT 6.1; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 In-Reply-To: <1f95d7ab-7451-4ced-9e26-e4522737bf0a@googlegroups.com> Xref: csiph.com comp.graphics.apps.gnuplot:2429 On 27.04.2014 16:04, jnw@xs4all.nl wrote: > The first one is: Now matter what I set FIT_LIMIT to (eg. 1.0e-14), > in fit.log it always says "limit for stopping : 1e-05". The gnuplot > output to stderr correctly reports "limit for stopping : 1e-14". Is > this a bug? It may have been a bug once. I don't see such misbehaviour in the current release version (4.6pl5), so odds are yours is just a little out of date. > I'm using a linear fit, as in f(x) = m * x + b fit f(x) "" > using 1:4:(1) via m,b The second question is: Is there a way to > include the final values of m and b in the plot? The best way of doing that depends on the version of gnuplot you have. Current ones should support the sprintf() method (see "help sprintf"). > The x-axis is a date, as in set xdata time set timefmt "%Y-%m-%d" set > xtics format "%d-%m" > The third question is: In what unit of time is the final value of m > expressed; or how do I get the value per day from the final value of > m given now? The unit of m is the quotient of y axis units divided by x axis units. In the case at hand, that's per second.