Re: smooth equation

Ben wrote:
> Greetings,
> 
> I have two sets of experimental data.
> I'd like to compare them, but the data are not obtain at the same
> points.
> 
> For example :
> Set 1 :
> #X   Y
> 0     0
> 0.5  0.5
> 1     1
> 
> Set 2 :
> #X     Y
> 0.1    0.15
> 0.4    0.41
> 0.62  0.58
> 0.99  0.99
> 
> You can see a deviation of set 2 regarding to set 1.
> My idea is to plot them with smooth.
> 
> Can we have the smooth equation back for Set 1 and 2 (called SE1 and
> SE2)?
> Because I'd like to plot SE1 - SE2 to have a graphic of an evaluation
> of the differences.

how should gnuplot in general calculate differences for different
x-values?

> If it isn't possible. Does somebody see a way of doing that? I ever
> think of fitting but the problem is to find the good equation, because
> I have very different shapes of data.

if you know that the data should be linear, I suggest to fit both sets 
simultanously and plot data - fit for both sets.

Tim