row.names {base} | R Documentation

## Get and Set Row Names for Data Frames

### Description

All data frames have a row names attribute, a character vector of length the number of rows with no duplicates nor missing values.

For convenience, these are generic functions for which users can write other methods, and there are default methods for arrays. The description here is for the `data.frame` method.

### Usage

    row.names(x)
    row.names(x) <- value

### Arguments

`x` | object of class `"data.frame"`, or any other class for which a method has been defined.
`value` | a vector with the same length as the number of rows of `x`, to be coerced to character. Duplicated or missing values are not allowed.

### Value

`row.names` returns a character vector.
`row.names<-` returns a data frame with the row names changed.

### Note

`row.names` is similar to `rownames` for arrays, and it has a method that calls `rownames` for an array argument.

### References

Chambers, J. M. (1992) Data for models. Chapter 3 of Statistical Models in S eds J. M. Chambers and T. J. Hastie, Wadsworth & Brooks/Cole.

### See Also

`data.frame`, `rownames`.

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