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# Spline interpolation excel vba

Algorithm to find the interpolating cubic spline [ edit] We wish to find each polynomial given the points through . To do this, we will consider just a single piece of the curve, , which will interpolate from to . This piece will have slopes and at its endpoints. Or, more precisely, The full equation can be written in the symmetrical form (1) where.

Here is how the syntax looks: =GROWTH (known_y’s, [known_x’s], [new_x’s], [const]) To interpolate data in Excel by using the GROWTH function, you may follow these steps: Insert. Jun 20, 2002 Messages 8,056 Office Version 365 Sep 5, 2008 #2 Normalize your data so that it has four columns: (1) X value (2) Y value (3) instance (4) data value Then, consider running a regression. Cubic spline interpolation is a way of finding a curve that connects data points with a degree of three or less. Splines are polynomial that are smooth and continuous across a.

I am interested in using cubic splines to do data interpolation and extrapolation in Excel 2010. I have heard of the add-on package xlxtrfun, however it apparently is not compatible with Excel.

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