Hi All,

I'm trying to use the "fit" function on some data that I collected in a

school experiment, but "fit" keeps on dying and giving the error "undefined

value during function evaluation". I am to fit data onto the following data:

20 78\n25 61\n30 45\n35 34\n40 24\n45 18\n50 13\n55 10

60 8\n65 6\n70 4\n75 3\n80 2

Using the function to be fitted as:

f(x) = a * exp(-1 * b * x) ; Where a, b are the constants fit is supposed to

give me

I am using gnuplot v. 3.7 patchlevel 1 on a WinXP box. After fit dies, I

used the command "show vars" to see what a and b during fitting and they

were:

pi = 3.14159265358979

a = 3.87069662567025e+40

b = 8.84029163816757e+42

Is fit dying because a and b are overflowing? How do I get a exponential

decay model out of my data set? I really need the values for my report, you

see.

I'm not a member of the mailing list, so send the suggestions to

Thanks in advance.

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