Directional: Arotation – R documentation

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Arotation

Rotation axis and angle of rotation given a rotation matrix

Given a 3 x 3 rotation matrix, the angle and the axis of rotation are calcualted.

Arotation(A)

`A`	A 3 x 3 rotation matrix.

If the user does not supply a rotation matrix a message will appear.

A list including:

`angle`	The angle of rotation expressed in degrees.
`axis`	The axis of rotation. A vector of two components, latitude and longitude, expressed in degrees.

Michail Tsagris R implementation and documentation: Michail Tsagris mtsagris@uoc.gr and Giorgos Athineou <gioathineou@gmail.com>

Course webpage of Howard E. Haber. http://scipp.ucsc.edu/~haber/ph216/rotation_12.pdf

Ted Chang (1986). Spherical Regression. Annals of Statistics, 14(3): 907-924.

ksi <- c(25.31, 24.29)
theta <- 2.38
A <- rot.matrix(ksi, theta, rads = FALSE)
A
Arotation(A)

A Collection of R Functions for Directional Data Analysis

v4.9

GPL-2

Authors

Michail Tsagris, Giorgos Athineou, Anamul Sajib, Eli Amson, Micah J. Waldstein

Initial release

2021-03-26