Minor bug correction

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/stdiag@33 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
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git-svn-id: svn://svn.r-forge.r-project.org/svnroot/stdiag@34 edb9625f-4e0d-4859-8d74-9fd3b1da38cb
bug correction

git-svn-id: svn://svn.r-forge.r-project.org/svnroot/stdiag@35 edb9625f-4e0d-4859-8d74-9fd3b1da38cb