Groups > comp.graphics.apps.gnuplot > #3664

Re: What's new in gnuplot 5.2

From	Hans-Bernhard Bröker <HBBroeker@t-online.de>
Newsgroups	comp.graphics.apps.gnuplot
Subject	Re: What's new in gnuplot 5.2
Date	2017-06-03 22:45 +0200
Message-ID	<91f133a9-ec73-423a-fb72-de13397f48aa@t-online.de> (permalink)
References	(1 earlier) <b30f5dfe-333f-4a47-b61e-ab6e6b0a96fc@googlegroups.com> <ogr70t$1b2$1@solani.org> <022e551d-f7c4-44a1-973b-f8db0375854b@googlegroups.com> <ogrdkh$4tc$1@solani.org> <ec3a75fe-478f-458a-a42d-4629c2cf45a5@googlegroups.com>

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Am 03.06.2017 um 21:49 schrieb hugocoolens@gmail.com:


>> Just out of curiosity, what is the function you try to fit?
> this is one example:
> f(x)=20*log10(a/(1+(x/b)**2)**0.5)
> a should be positive but sometimes Gnuplot makes it negative

Often the function can be transformed a bit to lift such requirements. 
In this case, you could just fit

	f(x) = 10 * log10(a**2 / (1 + (x / b)**2))

or

	f(x) = 20 * log10a - 10 * log10(1 + (x / b)**2)

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What's new in gnuplot 5.2 Raoul Fleckman <raoul.fleckman@gmail.com> - 2017-05-26 21:13 +0000
  Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-05-31 23:16 -0700
    Re: What's new in gnuplot 5.2 Karl Ratzsch <mail.kfr@gmx.net> - 2017-06-02 10:18 +0200
      Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-02 02:32 -0700
        Re: What's new in gnuplot 5.2 Karl Ratzsch <mail.kfr@gmx.net> - 2017-06-02 12:11 +0200
          Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-03 12:49 -0700
            Re: What's new in gnuplot 5.2 Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2017-06-03 22:45 +0200
              Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-05 01:32 -0700
                Re: What's new in gnuplot 5.2 Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2017-06-05 14:47 +0200
                Re: What's new in gnuplot 5.2 "hugocoolens@gmail.com" <hugocoolens@gmail.com> - 2017-06-06 23:34 -0700
                Re: What's new in gnuplot 5.2 Dr Engelbert Buxbaum <engelbert_buxbaum@hotmail.com> - 2017-06-07 14:26 +0200

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