Re: operations on (X,Y) series

[Frederic Parrenin <parrenin ujf-grenoble fr>]

Hi Jean,

> > I would like to do various operations on (x_i,y_i) series in gnumeric,
> > e.g.:
> > - resampling, by simple interpolation or by integration, with a linear,
> > spline or staircase interpolant
> > - filtring by various methods
> > - smoothing by various methods
> > - fitting
> > - principal components
> > - Periodogram
> > - etc.

> Do you want to implement that in sheets, in graphs, or both?
> Both sheets and graphs have already more regressions than linear.

I thought in sheets.

There is one specific thing I would like to do in graphs.
It is a visual correlation tool for two XY series. With that tool, you
can stretch the X-scale of a serie to fit with another serie.
This tool is available in a free software called AnalySeries,
unfortunately only available on the Mac.

This software also do the various math operations on XY series I
described above. Its author (Didier Paillard) is a colleague/friend of
me, so we could collaborate with him.
For example, we could extract the math from AnalySeries into a library
and use it in this gnumeric plugin.

> I hopee we can collaborate on that. I'm interested by these features
> too.

Very good!
I think I can understand and write the math algorithms, but I am a
newbie in terms of UI programming.

Best regards,

                Frédéric