R: Object Attribute Lists

attributes {base} | R Documentation

## Object Attribute Lists

### Description

These functions access an object's attribute list. The first form above returns the an object's attribute list. The assignment forms make the list on the right-hand side of the assignment the object's attribute list (if appropriate).

### Usage

    attributes(obj)
    attributes(obj) <- list
    mostattributes(obj) <- list

### Arguments

`obj` | an object

### Details

The `mostattributes` assignment takes special care for the `dim`, `names` and `dimnames` attributes, and assigns them only when that is valid whereas as `attributes` assignment would give an error in that case.

### See Also

`attr`.

### Examples

    x <- cbind(a=1:3, pi=pi) # simple matrix w/ dimnames
    str(attributes(x))

    ## strip an object's attributes:
    attributes(x) <- NULL
    x # now just a vector of length 6

    mostattributes(x) <- list(mycomment = "really special", dim = 3:2,
       dimnames = list(LETTERS[1:3], letters[1:5]), names = paste(1:6))
    x # dim(), but not {dim}names

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