| To: | s-news@lists.biostat.wustl.edu |
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| Subject: | how to extract the elements of a list of vectors in a fixed position? |
| From: | carol white <wht_crl@yahoo.com> |
| Date: | Thu, 15 Nov 2007 10:13:03 -0800 (PST) |
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Hi, How is it possible to extract the elements of a list of vectors in a fixed position? suppose that I have a list of 2-element vectors, how can I extract the 2nd element of all vectors in the list? Can it be done with indexing and not by element name because my elements don't have name? Thanks carol So in this example, I want to extract 2 and 4 v = list (c(1,2), c(3, 4)) > v [[1]] [1] 1 2 [[2]] [1] 3 4
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