randomized whitening function.

uses random matrix to whiten a matrix

randwhiten(A, k, seed = NA)

Arguments

A

input matrix

k

rank to use

seed

for testing

Value

whitened matrix is output

References

N. Halko, P.G. Martinsson, J. Tropp "Finding structure with randomness: Stochastic algorithms for constructing approximate matrix decompositions" arXiv 0909.4061

Author

Avants BB

Examples

A <- matrix(rnorm(3000), ncol = 50)
k <- 10
Aw <- randwhiten(A, k)
# (Aw) %*% t(Aw)