least angle regression, lasso, positive lasso and forward stagewise

 This GNU R package provides efficient procedures for fitting an entire
 lasso sequence with the cost of a single least squares fit. Least angle
 regression and infinitessimal forward stagewise regression are related
 to the lasso described in http://www-stat.stanford.edu/~hastie/Papers/#LARS.
 .
 This is a modified version of the original lars package by Hastie and Efron,
 providing a LARS modification for non-negative lasso.