[Libreoffice-bugs] [Bug 107955] New: Implement an interpolation function

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=107955

            Bug ID: 107955
           Summary: Implement an interpolation function
           Product: LibreOffice
           Version: 5.3.0.0.alpha0+
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: Calc
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: frederic.parrenin at univ-grenoble-alpes.fr

In an lot of scientific fields, we need to do interpolation of data.
That is, if you have a set of x_i and y_i, you want to know the values y'_i at
abscissas x'_i.
Currently, there is no interpolation function in calc, though.
I would greatly appreciate one.
The basic functionality would be to have a linear interpolation.
Other type of interpolation include staircase and cubic spline.
All these interpolations could be done by simply evaluating the function, or
also by using an averaging between two consecutive x'_i.
Such a function exists in another spreadsheet software called gnumeric, so it
is possible to take some inspiration from it (with a critical look, though).

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