Transpose an array by permuting its dimensions and optionally resizing it.
aperm(a, perm, …)
# S3 method for default
aperm(a, perm = NULL, resize = TRUE, …)
# S3 method for table
aperm(a, perm = NULL, resize = TRUE, keep.class = TRUE, …)the array to be transposed.
the subscript permutation vector, usually a permutation of
the integers 1:n, where n is the number of dimensions
of a. When a has named dimnames, it can be a
character vector of length n giving a permutation of those
names. The default (used whenever perm has 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 TRUE).
logical indicating if the result should be of the
same class as a.
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
transposing matrices.
Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.
t, to transpose matrices.
# NOT RUN {
# 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 contingency table
# }
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