| 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 resize = FALSE then the
returned object has the same dimensions as a, and the dimnames
are dropped. In each case other attributes are copied from a.
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])