double exponential smoothing

Dear Gnumeric fans,

This is a request for enhancement.
Would it be possible to implement double exponential smoothing in Gnumeric?
(sorry, I am not skilled enough to do it myself)

While simple exponential smoothing does exist (in particular in graphs), it does not work for curves with a trend.
Many references exist on the web for exponential smoothing.
This one is in french :

Thanks a lot a keep up the good work.

Frédéric Parrenin


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