aperm {base} | R Documentation |
Transpose an array by permuting its dimensions and optionally resizing it.
aperm(a, perm, resize = TRUE)
a |
the array to be transposed. |
perm |
the subscript permutation vector, which must be a
permutation of the integers 1:n , where n is the
number of dimensions of a . The default is to reverse the
order of the dimensions. |
resize |
a flag indicating whether the vector should be
resized as well as having its elements reordered (default TRUE ). |
A transposed version of array a
, with subscripts permuted as
indicated by the array perm
. If resize
is TRUE
,
the array is reshaped as well as having its elements permuted, the
dimnames
are also permuted;
if FALSE
then the returned object has the same dimensions as
a
, and the dimnames are dropped.
The function t
provides a faster and more convenient way of
transposing matrices.
Jonathan Rougier, J.C.Rougier@durham.ac.uk did the faster C implementation.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
t
, to transpose matrices.
# interchange the first two subscripts on a 3-way array x x <- array(1:24, 2:4) xt <- aperm(x, c(2,1,3)) stopifnot(t(xt[,,2]) == x[,,2], t(xt[,,3]) == x[,,3], t(xt[,,4]) == x[,,4])