R: SRVF transform of warping functions

SqrtMedian {fdasrvf}

R Documentation

SRVF transform of warping functions

Description

This function calculates the srvf of warping functions with corresponding shooting vectors and finds the median

Usage

SqrtMedian(gam)

Arguments

gam

matrix (N x M) of M warping functions with N samples

Value

Returns a list containing

`median`	Karcher median psi function
`gam_median`	Karcher mean warping function
`psi`	srvf of warping functions
`vec`	shooting vectors

References

Srivastava, A., Wu, W., Kurtek, S., Klassen, E., Marron, J. S., May 2011. Registration of functional data using fisher-rao metric, arXiv:1103.3817v2 [math.ST].

Tucker, J. D., Wu, W., Srivastava, A., Generative Models for Function Data using Phase and Amplitude Separation, Computational Statistics and Data Analysis (2012), 10.1016/j.csda.2012.12.001.

Examples

data("simu_warp_median")
out = SqrtMedian(simu_warp_median$gam)

[Package fdasrvf version 1.9.7 Index]