## Factor Codes

## Usage

    codes(x)
    codes(x) <- value

## Value

This (generic) function retrieves the underlying integer codes used for the levels of a factor and can also be used to reset (a subset of) these codes.

## See Also

`factor`, `levels`, `nlevels`.

## Examples

    x <- gl(3,5)
    codes(x)[3] <- 2
    all(unique(codes(x)) == 1:nlevels(x))#- should be true for ALL factors

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