# row

##### Row Indexes

Returns a matrix of integers indicating their row number in a matrix-like object, or a factor indicating the row labels.

- Keywords
- array

##### Usage

`row(x, as.factor = FALSE)`

##### Arguments

- x
a matrix-like object, that is one with a two-dimensional

`dim`

.- as.factor
a logical value indicating whether the value should be returned as a factor of row labels (created if necessary) rather than as numbers.

##### Value

An integer (or factor) matrix with the same dimensions as `x`

and whose
`ij`

-th element is equal to `i`

(or the `i`

-th row label).

##### References

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

##### See Also

`col`

to get columns.

##### Examples

`library(base)`

```
# NOT RUN {
x <- matrix(1:12, 3, 4)
# extract the diagonal of a matrix
dx <- x[row(x) == col(x)]
dx
# create an identity 5-by-5 matrix
x <- matrix(0, nrow = 5, ncol = 5)
x[row(x) == col(x)] <- 1
x
# }
```

*Documentation reproduced from package base, version 3.4.3, License: Part of R 3.4.3*

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