Directional: rot.matrix – R documentation

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rot.matrix

Rotation matrix from a rotation axis and angle of rotation

It calculates a rotation matrix from a rotation axis and angle of rotation.

rot.matrix(ksi, theta, rads = FALSE)

`ksi`	The rotation axis, a vector with two elements, the first is the latitude and the second is the longitude.
`theta`	The angle of rotation.
`rads`	If both the ksi and theta are in rads, this should be TRUE. If both the ksi and theta are in degrees, this should be FALSE.

The function accepts as arguments the rotation axis and the angle of rotation and it calcualtes the requested rotation matrix.

A 3 x 3 rotation matrix.

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