minvd: Inverts a triangular matrix (double precision)
Description
See Marazzi A. (1993), p.348Usage
minvd(r, n, tau = .dFvGet()$tua)
References
Marazzi A. (1993) Algorithm, Routines, and S functions
for Robust Statistics. Wadsworth & Brooks/cole, Pacific Grove,
California. p.348