Algorithms

Calculates a 1^st or 2^nd gap derivative. The algorithm uses a specified gap distance to skip that number of points to take the differences instead of adjacent data points. In the current release, the values are not normalized to the number of points used in forming the derivative gap.

Note: The values obtained are (dx) times larger than the point difference model. The original paper was ratioing the data over the same spanned region, thereby canceling (dx).

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