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List:       gnuplot-info
Subject:    Re: help for gnuplot
From:       matuda () film ! s ! dendai ! ac ! jp
Date:       2002-08-15 15:43:03
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Hello!

Division of integer by integer such as 1/2(=0) seems to cause a trouble.
Those should be rewrite to 1.0/2 or 1/2.0.

>We are two 3rd year students at Edinburgh University attempting to 
>fit a line of best fit to the recent foot and mouth outbreak in United 
>Kingdom.  We have a non-linear model which we are trying to fit for 
>two parameters (a and b) but when we try to fit it, the output says 
>'undefined output during function evaluation'.  We are using 
>gnuplot 3.7 in windows.  Here is the model which we are typing in:
>f(x)=(115*a*b-1/2*sqrt(115)*sqrt(a*b)*sqrt(2)*tanh((1/2*x*sqrt(a*b)-
>1/230*sqrt(2)*sqrt(115)*atanh(203/46*b*sqrt(2)*sqrt(115)/(sqrt(a*b))))
>*sqrt(115)*sqrt(2))**2)/(a*b) 
>
>If you could give us any help on what the problem is and how to 
>solve it we would be very grateful.
>
>Alex Stannard and Lisa Dilley

Good luck!

Namio MATUDA <matuda@film.s.dendai.ac.jp>
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