Re: [Gnuplot-info] gnuplot

[Hans-Bernhard B. <HBB...@t-...>]

On 19.03.2011 19:44, Dmitrij Jaworski wrote:

> The data-processing program I use is gnuplot.

That may not be the right tool for the job.  gnuplot is a plotting 
program, not a data processing engine.  It does offer some data 
processing as an aid for the plotting work, but it's not supposed to 
replace an actual data management tool.

> I would like to ask you if it is possible, when fitting, to establish
> certain relationships between parameters.

No.  But you can re-define your parameters such that such relations are 
automatically taken care of.

> For example: for the
> fitting, I use a function f (x) = a + b * x and parameter 'a' must
> be>  -3b (larger than -3b).

So fit

	f(x)= (a_internal**2-3b) + b * x

then extract the actual a from sqrt(a_internal)
I'll be very grateful for the help.
> Sincerely.