Specifically note that, unlike C, R has true multidimensional arrays
which are more than pointer jumps: the practical result of this is
that you want to use a single subsetting ( x[i,j] ) and specify them
both in one call -- x[i][j] instead gives you the "j"th element of
the "i"th element which ma
Please read An Introduction to R, which ships with every copy of R,
where you will learn how to properly subscript data frames and lists,
among other things. There is a reason for such tutorials -- they
enable you to avoid elementary mistakes like this and wasting time and
effort with such posts as
It is not clear to me from your description what exactly you are trying to
do, but to get the numbers in the second line of aa you could use
as.numeric(aa[2,])
HTH,
Jorge.-
On Wed, Aug 1, 2012 at 5:13 PM, Jie Tang <> wrote:
> I defined a data.frame by a two-dimensional array.
> > aa = data.fr
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