# t

##### Matrix Transpose

Given a matrix or `data.frame`

`x`

,
`t`

returns the transpose of `x`

.

- Keywords
- array

##### Usage

`t(x)`

##### Arguments

- x
a matrix or data frame, typically.

##### 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 a 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.

##### Note

The *conjugate* transpose of a complex matrix \(A\), denoted
\(A^H\) or \(A^*\), is computed as `Conj(t(A))`

.

##### 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

`library(base)`

```
# NOT RUN {
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")
# }
```

*Documentation reproduced from package base, version 3.5.1, License: Part of R 3.5.1*

### Community examples

**richie@datacamp.com**at Jan 17, 2017 base v3.3.2

`t()` transposes the rows and columns of matrices. ```{r} (a_matrix <- matrix( 1:30, 5, 6, dimnames = list(rows = letters[1:5], cols = LETTERS[1:6]) )) t(a_matrix) ``` It also works with data frames, but the result is coerced to be a matrix. That means that every column becomes the same type! ```{r} data(npk) # A nitrogen, phosphate, potassium experiment npk # a data.frame with factor and numeric cols t(npk) # a character matrix ``` `t()` fails with higher dimensional arrays. You want [`aperm()`](https://www.rdocumentation.org/packages/base/topics/aperm) for this instead. ```{r} an_array <- array(1:24, 2:4) tryCatch( t(an_array), error = print ) ```