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

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