Expmap: Exponential map
In spherepc: Spherical Principal Curves

Description Usage Arguments Details Value Author(s) References See Also Examples

This function performs the exponential map at (0, 0, 1) on the unit 2-sphere.

1	Expmap(vec)

vec

element of two-dimensional Euclidean vector space.

This function performs exponential map at (0, 0, 1) on the unit sphere. vec is an element of the tangent plane of the unit sphere at (0, 0, 1), and the result is an element of the unit sphere in three-dimensional Euclidean space.

three-dimensional vector.

Jongmin Lee

Fletcher, P. T., Lu, C., Pizer, S. M. and Joshi, S. (2004). Principal geodesic analysis for the study of nonlinear statistics of shape. IEEE Transactions on Medical Imaging, 23, 995-1005.

Logmap.