PO.Math.DataDiff
Description
Calculates derivative for data samples at point t with smoothing.
Syntax
=PO.Math.DataDiff(x_values, y_values, t, l)Parameters
| Parameter | Description |
|---|---|
| x_values | Sample points (N), strictly increasing. |
| y_values | Sample values (N) of each segment starting at the corresponding sample point. |
| t | One of x_values: the sample point at which to calculate the derivative. |
| l | Smoothing, in the units of x_values: on each side of t the nearest sample at least l away is used. l=0 uses the adjacent samples. Where one side has none that far, the difference is one-sided; where neither has, it is an error. |