Given a matrix or data.frame x, t returns the transpose of x.

data.frame

x

t

t(x)

a matrix or data frame, typically.

A matrix, with dim and dimnames constructed appropriately from those of x, and other attributes except names copied across.

dim

dimnames

This is a generic function for which methods can be written. The description here applies to the default and "data.frame" methods.

"data.frame"

A data frame is first coerced to a matrix: see as.matrix. When x is a vector, it is treated as a column, i.e., the result is a 1-row matrix.

as.matrix

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

aperm for permuting the dimensions of arrays.

aperm

a <- matrix(1:30, 5, 6) ta <- t(a) ##-- i.e., a[i, j] == ta[j, i] for all i,j : for(j in seq(ncol(a))) if(! all(a[, j] == ta[j, ])) stop("wrong transpose")

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