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Extremely efficient procedures for fitting the entire lasso or elasticnet regularization path for linear regression, logistic and multinomial regression models, Poisson regression and the Cox model. Two recent additions are the multipleresponse Gaussian, and the grouped multinomial regression. The algorithm uses cyclical coordinate descent in a pathwise fashion, as described in the paper linked to via the URL below.
Package details 


Author  Jerome Friedman [aut, cre], Trevor Hastie [aut, cre], Rob Tibshirani [aut, cre], Noah Simon [aut, ctb], Balasubramanian Narasimhan [ctb], Junyang Qian [ctb] 
Maintainer  Trevor Hastie <[email protected]> 
License  GPL2 
Version  2.016 
URL  http://www.jstatsoft.org/v33/i01/. 
Package repository  View on CRAN 
Installation 
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