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# CITATION.cff file created with {cffr} R package
# See also: https://docs.ropensci.org/cffr/
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cff-version: 1.2.0
message: 'To cite package "GFT" in publications use:'
type: software
license: MIT
title: 'GFT: Generalized Fisher Transformation of Correlation Matrices'
version: 1.2.0
doi: 10.32614/CRAN.package.GFT
abstract: 'Forward and inverse generalized Fisher transformation (GFT) of correlation
  matrices, gamma = vecl(log C), which maps the positive definite correlation matrices
  one-to-one onto the Euclidean space of dimension n(n-1)/2, see Archakov and Hansen
  (2021) <https://doi.org/10.3982/ECTA16910>. The inverse is computed from a variational
  characterization by the GFT-FP+N algorithm: matrix-free inexact Newton steps for
  the log-diagonal residual, solved by preconditioned conjugate gradients, with fixed-point
  safeguards that guarantee global convergence. Sequential inversion with a tangent
  predictor, a certified quadrature preconditioner, and comparison solvers (the plain
  fixed point, Broyden''s method, full Newton, Anderson acceleration, and limited-memory
  BFGS) are included. Uses base R only.'
authors:
- family-names: Archakov
  given-names: Ilya
- family-names: Hansen
  given-names: Peter Reinhard
  email: hansen@unc.edu
repository: https://reinhardhansen.r-universe.dev
repository-code: https://github.com/reinhardhansen/GFT
commit: 663d25d86e4dceedb8f5e8aa7694d398b5ab97ab
url: https://github.com/reinhardhansen/GFT
date-released: '2026-09-22'
contact:
- family-names: Hansen
  given-names: Peter Reinhard
  email: hansen@unc.edu