[Gnuplot-info] Help needed with curve fitting function

[Gopesh P. <gop...@ya...>]

Hello members,

I have a data file containing two columns and I have a fitting function like
this : f1(x) = a1 * sin(x) + b1 

Now I want to multiply my fitting function with 1st value of the 2nd column
like this:
f1(x) = a1 * [1st value of 2nd column * sin(x)] + b1. 

Is it possible to access the individual values of the column and use them
like above ? Or can I declare some variable and store individual value in
and use it in fitting function?

Thanks and regards,
Gopesh
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