Rbar {geostats}

calculate \bar{R}

Description

Given n circular or spherical measurements, the length of their normalised vector sum (\bar{R}) serves as a measure of directional concentration.

Usage

Rbar(trd, plg = 0, option = 0, degrees = FALSE)

Arguments

trd

trend angle, in degrees, between 0 and 360 (if degrees=TRUE) or between 0 and 2\pi (if degrees=FALSE).

plg

(optional) plunge angle, in degrees, between 0 and 90 (if degrees=TRUE) or between 0 and 2\pi (if degrees=FALSE).

option

scalar. If option=0, then plg is ignored and the measurements are considered to be circular; if option=1, then trd is the azimuth and plg is the dip; if option=2, then trd is the strike and plg is the dip; if option=3 then trd is the longitude and plg is the latitude.

degrees

TRUE for degrees, FALSE for radians

Value

a value between 0 and 1

Examples

data(striations,package='geostats')
Rbar(striations,degrees=TRUE)