How to refer to the last a few rows?
On Mon, Sep 14, 2009 at 9:37 AM, baptiste auguie
<baptiste.auguie at googlemail.com> wrote:
Hi, tail(x,2)
Is there a convenient function like 'tail()' to extract last a few columns? I can use t(tail(t(x),2)). But I feel convenient if there is a function can give me such thing directly.
or ?x[seq(nrow(x)-1, nrow(x)), ] HTH, baptiste 2009/9/14 Peng Yu <pengyu.ut at gmail.com>
Hi, x=matrix(1:60,nr=6) I can refer the last 2 rows by x[5:6,] If I don't know the total number of rows is 6, is there a way to refer the last 2 rows? Regards, Peng
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_____________________________ Baptiste Augui? School of Physics University of Exeter Stocker Road, Exeter, Devon, EX4 4QL, UK http://newton.ex.ac.uk/research/emag ______________________________