Changelog
Source:NEWS.md
quadrupen 1.0-0 (2026-06-05)
- major updates
- complete rewriting of R code using R6 classes
- complete rewriting of C++ code using template and OO style programming
- included ‘FusedLasso’ from the archived package by Holger Hoefling (fixed CRAN’s complaints)
- added group-lasso/group-elastic and variants (group penalty: l1/l2, l1/linf, cooperative Lasso)
- added sparse group-lasso/group-elastic and variant (group penalty: l1/l2, l1/linf, cooperative Lasso)
- added lava and/post-lava (combination of sparse and dense regularization, Chernozukov et al, 2017)
- extended to group-lava (group penalty: l1/l2, l1/linf, cooperative Lasso)
- added mcp and scad (concave penalties, Chernozukov et al, 2017)
- added refit version of Lasso/Elastic-Net (“relaxed” Lasso/Enet)
- changing many parameters (badly) named, do not expect backward compatibility
- added vignettes
- minor updates
- Integration of changes from CRAN versions from 0.2-4 to 0.2-13
- set up github workflow for pkgdown page
- various fixes, more testing
quadrupen 0.2-4 (2014-01-16)
CRAN release: 2014-01-16
Minor: - memory leak corrected (sp_mat declaration) - linking to Rcpp/RcppArmadillo headers (requires R 3.0-2)
quadrupen 0.2-4 (2013-11-01)
CRAN release: 2014-01-16
- added a ‘lasso’ function, simple wrapper to the elastic-net ‘function’
- added computation of degrees of freedom (for elastic net and bounded regression)
- added a method to compute penalized criteria (BIC/AIC) of a quadrupen fit, with plot
quadrupen 0.2-2 (2013-04-08)
CRAN release: 2013-04-08
- minor fix to comply with recent ggplot2 updates.
quadrupen 0.2-1 (2013-02-27)
CRAN release: 2013-02-27
- minor fix to pass CRAN check on Windows operating systems.
quadrupen 0.2-0 (2013-02-26)
- Major updates
- added bounded regression (regression penalized by infinity norm + structured l2 norm)
- added corresponding features for cross-validation and stability path
- Minor updates
- corrected wrong annotations of the stability path (PFER)
- handled normalization internally (‘normalize’ is no longer a parameter)
- more simple internal handling of penscales and correction of the rescaling of the intercept
- better use of multicore features
- handled runtime error exception in RcppArmadillo when the system is singular (end of the solution path) A consequence is quadrupen is less likely to crash due to user’s “bad” parametrisation
- simplification of the C++ code, bugs corrected, probably new ones added :-’(
- added ‘examples’ and ‘tests’ directories