[Gnuplot-info] (no subject)

[Donald B. <dm...@re...>]

Hi All,

I'm having a spot of bother using gnuplot 4.0 and wondered if any body
could please help. I'm trying to fit a function to a set of data points.
The function is:-

f(x) = A*exp(B*x)

and the fit command is:-

fit f(x) "beam-diameter.dat" via A,B

I get the error message:-

Undefined value during function evaluation

and the log file contains:-

Wed Aug  4 12:02:19 2004


FIT:    data read from "beam-diameter.dat"
        #datapoints = 7
        residuals are weighted equally (unit weight)

function used for fitting: f(x)
fitted parameters initialized with current variable values

BREAK:          Undefined value during function evaluation

The funny thing is I can evaluate f(x) from the command line just fine.
Any ideas anybody?

Many Thanks

Donald.

PS Could you please email copy me any replies as I'm not allowed to
subscribe to lists from the companies email accounts!