keyfct.grad.hn: The gradient of the half-normal key function
Description
The key function contains one parameter, the scale.
Current implementation assumes that scaled dist is x/scale, not x/width
Usage
keyfct.grad.hn(distance, key.scale)
Value
vector of derivatives of the half-normal key function w.r.t. the
scale parameter
Arguments
- distance
perpendicular distance vector
- key.scale
vector of scale values
Details
d key / d scale = exp(-y ^ 2 / (2 scale ^ 2)) * (y ^ 2 / scale ^ 3)