Re: Interpolate within two data sets

Hello Lorenzo

Thank you for your suggestion.
I would like to avoid a graphics class as I am not using any graphics, but I will look into it.

Thanks a lot,
Hermann

On Wed, 2011-06-29 at 20:19 +0000, Lorenzo Moneta wrote:
> Hi Hermann,
>
> Hi HErmann,
>
> If I understood well you want to perform an interpolation in 2 dimension (length and energy). The interpolator class can
> be used for one-dim data, for example in your case to get new values at different length than those given.
>
> You might want try to use the TGraph2D class and its Interpolate function.
>
> Regards,
> Lorenzo
> On Jun 27, 2011, at 9:41 AM, Hermann Fuchs wrote:
>
> > Dear Root-Users
> >
> > I do have two data sets, describing measurements at different energies,
> > each data set contains a length(position) and an arbitrary value (of
> > interest). The number of data points within these sets can be different
> > (different positions as well).
> >
> > I want to interpolate values at an energy in between these two.
> > To use the Interpolator function I would basically need to create a
> > third data set at an energy in between these two.
> >
> > What I found so far: I could implement it in the following way:
> > Use Interpolator class to interpolate data set A to get a fixed number
> > of data points, do the same with data set B. Now call the Interpolator
> > for every data point in A and B to get the new data set.
> > This sounds quite inefficient to me. Is there a better way to do that?
> >
> > Example (I just made up the values)
> > A(@100MeV)
> > length value
> > 0.15 23
> > 0.25 26
> > 0.35 43
> > 0.45 44
> > 0.55 50
> >
> > B(@200MeV)
> > length value
> > 0.17 24
> > 0.27 27
> > 0.37 44
> >
> > Cheers,
> > Hermann
> >
> > --
> > -------------
> > DI Hermann Fuchs
> > Div. Medical Radiation Physics
> > Department of Radiotherapy
> > Med. Univ. Vienna / AKH Vienna
> > Währinger Gürtel 18-20
> > A-1090 Wien
> >
> > Tel. + 43 / 1 / 40 400 7271
> > Mail. hermann.fuchs_at_meduniwien.ac.at
> >
>
>

-- 
-------------
DI Hermann Fuchs
Div. Medical Radiation Physics
Department of Radiotherapy
Med. Univ. Vienna / AKH Vienna
Währinger Gürtel 18-20
A-1090 Wien

Tel.  + 43 / 1 / 40 400 7271
Mail. hermann.fuchs_at_meduniwien.ac.at