Matrix Transpose

Description

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

Usage

t(x)

Arguments

Details

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

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

Value

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

References

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

See Also

aperm for permuting the dimensions of arrays.

Examples

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")