A natural cubic spline with continuous second derivative in the interior and zero second derivative at the end points. Integrate from point t1 up to point t2.

Excel Function Syntax

CubicSplineIntegrateT1T2(xValues, yValues, t1, t2)

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Parameter Value Description
xValues The x values.
yValues The y values.
t1 Left bound of the integration interval [t1,t2].
t2 Right bound of the integration interval [t1,t2].