change B generation and default values

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/correg@305 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
some doc

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/correg@306 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
bad weighting

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/correg@307 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
up

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/correg@308 edb9625f-4e0d-4859-8d74-9fd3b1da38cb