rotate_xy: Rotate a matrix of x and y coordinates by a radian
Description
Rotate a matrix of x and y coordinates by a radian
Usage
rotate_xy(xy_mat, rad, direction = 1)
Arguments
- xy_mat
A two column matrix with x and y coordinates.
- rad
Numeric. Rotation angle in radian.
- direction
Numeric. Rotation direction, 1 for clockwise -1 for counter-clockwise.