Hi All, Wanted to add some more information ,regarding my problem. configuration of teh OS and R:--- Linux 2.6.18-6-686 > R.Version() $platform [1] "i486-pc-linux-gnu"
$arch [1] "i486" $os [1] "linux-gnu" $system [1] "i486, linux-gnu" $status [1] "Patched" $major [1] "2" $minor [1] "4.0" $year [1] "2006" $month [1] "11" $day [1] "25" $`svn rev` [1] "39997" $language [1] "R" $version.string [1] "R version 2.4.0 Patched (2006-11-25 r39997)" -- Thanks Moumita [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.