[R] list of lists, is this element empty

Ragia Ibrahim ragia11 at hotmail.com
Sat Dec 20 16:58:19 CET 2014

Kindly I have a list of lists as follow
[1] 7

[1] 3 4 5

as showen x[[3]] does not have a value and it has NULL, how can I check on this 
how to test if x[[3]] is empty.

thanks in advance
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