Rotation angle or distance

Calculates the angle (in radians) of the rotation taking one orientation to another.

Usage

rotation.angle(x)
rotation.distance(x, y)

Arguments

x,y

Two orientation objects

Value

rotation.distance returns a vector of length max(length(x), length(y))

containing the angle of the rotation taking corresponding elements of x to y (with the usual recycling rules if they are different lengths).

rotation.angle is equivalent to calculating the rotation.distance to the identity matrix.

Details

If y is missing in a call to rotation.distance, it is treated as the identity, i.e. rotation.angle(x) is calculated.

Author

Duncan Murdoch

See also

orientation-class, rotation.angle

Examples

rotation.angle(eulerzyx(1,0,0))
#> [1] 1
rotation.distance(eulerzyx(1,0,0), eulerzyx(0,1,0))
#> [1] 1.383436