Derivative for data samples at point t with smoothing.

Excel Function Syntax

DataDifferentiate(xValues, yValues, t, l)

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Parameter Value Description
xValues Sample points (N), sorted ascending.
yValues Samples values (N) of each segment starting at the corresponding sample point.
t Point t to interpolate at.
l Minimum distance between abscissa of the points and that of point t. l=0 (no smoothing).