Re: operations on (X,Y) series
- From: Jean Bréfort <jean brefort normalesup org>
- To: parrenin ujf-grenoble fr
- Cc: Gnumeric List <gnumeric-list gnome org>
- Subject: Re: operations on (X,Y) series
- Date: Wed, 02 Nov 2005 17:06:58 +0100
Le mercredi 02 novembre 2005 à 16:51 +0100, Frederic Parrenin a écrit :
I would like to do various operations on (x_i,y_i) series in gnumeric,
- resampling, by simple interpolation or by integration, with a linear,
spline or staircase interpolant
- filtring by various methods
- smoothing by various methods
- principal components
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.
OK, but I feel many of them would be nice in graphs too.
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 might be possible with two x-axis. It might be possible to adjust
one of the axis scale (I mean automatically adjust, not by hand, of
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.
The code must be release under the GPL.
I hopee we can collaborate on that. I'm interested by these features
I think I can understand and write the math algorithms, but I am a
newbie in terms of UI programming.
I can probably also do some work on the maths (although I did not made
much maths during the last 30 years).
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