Re: [R] How to detect NULL list element?

From: Barry Rowlingson <b.rowlingson_at_lancaster.ac.uk>
Date: Mon, 03 Nov 2008 08:03:03 +0000

2008/11/3 <rkevinburton_at_charter.net>:

> So how do I detect the NULL at r[1]?

 How can you detect what is not there?

 Single square brackets on a list give you a list. Double square brackets give you the elements.

 is.null(r[[1]]) should be TRUE.

Barry



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