Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.graphics.apps.gnuplot > #364
| Path | csiph.com!x330-a1.tempe.blueboxinc.net!usenet.pasdenom.info!aioe.org!feeder.news-service.com!fu-berlin.de!uni-berlin.de!news.dfncis.de!not-for-mail |
|---|---|
| From | Hans-Bernhard Bröker <HBBroeker@t-online.de> |
| Newsgroups | comp.graphics.apps.gnuplot |
| Subject | Re: trying to get a fit to work. |
| Date | Wed, 08 Jun 2011 23:02:12 +0200 |
| Lines | 25 |
| Message-ID | <95a69hFk43U1@mid.dfncis.de> (permalink) |
| References | <62b76acf-a50c-49f2-a02a-908398651e5b@q12g2000prb.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 ai74bEinAc2XEQSrGkxjrAAUHKFiGLBLLXCJ+K4P68zA2i/x38bt5HWwpe |
| Cancel-Lock | sha1:dlHIBXw/0+99csvGVqEVGMPeVyg= |
| User-Agent | Mozilla/5.0 (Windows; U; Windows NT 6.1; de; rv:1.9.2.15) Gecko/20110303 Thunderbird/3.1.9 |
| In-Reply-To | <62b76acf-a50c-49f2-a02a-908398651e5b@q12g2000prb.googlegroups.com> |
| Xref | x330-a1.tempe.blueboxinc.net comp.graphics.apps.gnuplot:364 |
Show key headers only | View raw
On 08.06.2011 01:32, aviphysics wrote:
> So I got this HPLC peak that I am trying to fit a exponentialized
> Gaussian to. It fits decently in Mathematica but trying to fit it in
> gnuplot yields "Undefined value during funtion evaluation"
> Any ideas what the problem might be?
It's exactly what the message says it is: that function's value is not
defined over the entire of the range you're trying to use it in. This
show up if you just plot this function in gnuplot:
p [0:160] modeltwo(x) with linespoints
Note how the curve ends around x==100, in particular:
gnuplot> print modeltwo(100)
3.16514318564887e-009
gnuplot> print modeltwo(105)
gnuplot> print modeltwo(105)
^
undefined value
The ultimate reason for that is that erfc() underflows for arguments as
large as you try to use it with here.
Back to comp.graphics.apps.gnuplot | Previous | Next — Previous in thread | Next in thread | Find similar
trying to get a fit to work. aviphysics <aviphysics@gmail.com> - 2011-06-07 16:32 -0700
Re: trying to get a fit to work. Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-06-08 23:02 +0200
Re: trying to get a fit to work. sfeam <sfeam@users.sourceforge.net> - 2011-06-08 21:48 -0700
Re: trying to get a fit to work. Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2011-06-09 22:26 +0200
Re: trying to get a fit to work. sfeam <sfeam@users.sourceforge.net> - 2011-06-09 18:29 -0700
csiph-web