X-Received: by 10.176.84.3 with SMTP id n3mr2216929uaa.28.1478166064352; Thu, 03 Nov 2016 02:41:04 -0700 (PDT)
X-Received: by 10.157.8.134 with SMTP id 6mr818276otf.17.1478166064262; Thu, 03 Nov 2016 02:41:04 -0700 (PDT)
Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.glorb.com!p16no455434qta.1!news-out.google.com!z32ni979qtc.1!nntp.google.com!n6no455961qtd.0!postnews.google.com!glegroupsg2000goo.googlegroups.com!not-for-mail
Newsgroups: comp.graphics.apps.gnuplot
Date: Thu, 3 Nov 2016 02:41:03 -0700 (PDT)
In-Reply-To: <nvcvov$qad$1@dont-email.me>
Complaints-To: groups-abuse@google.com
Injection-Info: glegroupsg2000goo.googlegroups.com; posting-host=130.56.80.185; posting-account=eO0UFAoAAAAttewk0-_prR-cK1_CGaJg
NNTP-Posting-Host: 130.56.80.185
References: <c9696e77-4fc9-4466-9175-bff4ac3d6ef0@googlegroups.com> <nvcvov$qad$1@dont-email.me>
User-Agent: G2/1.0
MIME-Version: 1.0
Message-ID: <65025da6-a456-46d5-b987-2b6d8dcbc692@googlegroups.com>
Subject: Re: fitting for Bateman equation returns NaN
From: apsara@connect.hku.hk
Injection-Date: Thu, 03 Nov 2016 09:41:04 +0000
Content-Type: text/plain; charset=UTF-8
Xref: csiph.com comp.graphics.apps.gnuplot:3430

On Thursday, November 3, 2016 at 2:12:59 AM UTC+11, Michael Okuntsov wrote:

> > N=7998.68795
> > M=8540.4184
> > A=.04951051
> >
> > direct(x)=M*exp(-B*x)
> > fed(x)=(A*N/(B-A))*(exp(-A*x)-exp(-B*x))
> > f(x)=fed(x)+direct(x)
> 
> Define initial parameter:
> 
> B=-0.1
> ...


Hi Michael,

Thank you! it works great now. Why do we define B, though, and is the -0.1 arbitrary? What do I define N or M as, if I want to fix A, B and fit via N or M?

Thanks :)