The rotation matrix `R_AB`

is created based on 3 angles `z`

, `y`

and `x`

about new axes (intrinsic) in the order z-y-x.
The angles (called Euler angles or Tait–Bryan angles) are defined by the following procedure
of successive rotations:

Given two arbitrary coordinate frames A and B, consider a temporary frame T that initially coincides with A. In order to make T align with B, we first rotate T an angle z about its z-axis (common axis for both A and T).

Secondly, T is rotated an angle y about the NEW y-axis of T.

Finally, T is rotated an angle x about its NEWEST x-axis. The final orientation of T now coincides with the orientation of B.

The signs of the angles are given by the directions of the axes and the right hand rule. Note that if A is a north-east-down frame and B is a body frame, we have that z=yaw, y=pitch and x=roll.

## Arguments

- z
Angle of rotation about new z axis

- y
Angle of rotation about new y axis

- x
Angle of rotation about new x axis

## Value

3x3 rotation matrix R_AB (direction cosine matrix) such that the relation between a vector v decomposed in A and B is given by: v_A = R_AB * v_B

## References

Kenneth Gade A Nonsingular Horizontal Position Representation.
*The Journal of Navigation*, Volume 63, Issue 03, pp 395-417, July 2010.