Compute the AIRM Vectorization of Tangent Space

Source: R/airm.R

Vectorizes a tangent matrix into a vector in Euclidean space using AIRM.

airm_vec(sigma, v)

Arguments

sigma

A symmetric positive-definite matrix of class dppMatrix, representing the reference point.

v

A symmetric matrix of class dspMatrix, representing a tangent vector.

Value

A numeric vector, representing the vectorized tangent image.

Examples

if (requireNamespace("Matrix", quietly = TRUE)) {
  library(Matrix)
  sigma <- diag(2) |>
    Matrix::nearPD() |>
    _$mat |>
    Matrix::pack()
  v <- diag(c(1, 0.5)) |>
    Matrix::symmpart() |>
    Matrix::pack()
  airm_vec(sigma, v)
}
#> [1] 1.0 0.0 0.5