Transpose an array by permuting its dimensions and optionally resizing it.
aperm(a, perm, ...) "aperm"(a, perm = NULL, resize = TRUE, ...) "aperm"(a, perm = NULL, resize = TRUE, keep.class = TRUE, ...)
- the array to be transposed.
- the subscript permutation vector, usually a permutation of
nis the number of dimensions of
ahas named dimnames, it can be a character vector of length
ngiving a permutation of those names. The default (used whenever
permhas zero length) is to reverse the order of the dimensions.
- a flag indicating whether the vector should be
resized as well as having its elements reordered (default
- logical indicating if the result should be of the
same class as
- potential further arguments of methods.
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
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]) UCB <- aperm(UCBAdmissions, c(2,1,3)) UCB[1,,] summary(UCB) # UCB is still a continency table
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