| aperm {base} | R Documentation |
Array Transposition
Description
Transpose an array by permuting its dimensions and optionally resizing it.
Usage
aperm(a, perm, resize = TRUE)
Arguments
a |
the array to be transposed. |
perm |
the subscript permutation vector, which must be a
permutation of the integers |
resize |
a flag indicating whether the vector should be
resized as well as having its elements reordered (default |
Value
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.
Author(s)
Jonathan Rougier, J.C.Rougier@durham.ac.uk did the faster C implementation.
See Also
t, to transpose matrices.
Examples
# 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])