straightness: Compute straightness index

In SESman/rbl: Biologging tools for diving predators in R

Description

straightness compute a straightness index between 0 and 1 by making the ration L / l where L is the cumulated distance between brokenstick points and and where l the cumulated distance between each y data points.

Usage

straightness(x, y = NULL, npts = 3)

sinuosity(x, y = NULL, npts = 3)

Arguments

x	The x data (time).
y	The y data (depth).
npts	The number of points to use. 2 is the minimum (from the start to the end of data). Each new point adds a step (using the brokenstick algorithm) which is taken into account when computing L.

Value

straightness returns a number between 0 (maximum sinuosity) to 1 (maximum straightness). sinuosity is equivalent to 1 / straightness.

Examples

data(exses)
ind(exses)
sunflowerplot(tdrply(straightness, cl = 1:2, ty = '_'), exses$stat$pca)

SESman/rbl documentation built on May 9, 2019, 11:10 a.m.