R: Physical and virtual attributes

physical.default {bit} | R Documentation

## Physical and virtual attributes

### Description

Compatibility functions (to package ff) for getting and setting physical and virtual attributes.

### Usage

    ## Default S3 method:
    physical(x)

    ## Default S3 replacement method:
    physical(x) <- value

    ## Default S3 method:
    virtual(x)

    ## Default S3 replacement method:
    virtual(x) <- value

    ## S3 method for class 'physical'
    print(x, ...)

    ## S3 method for class 'virtual'
    print(x, ...)

    physical(x)

    physical(x) <- value

    virtual(x)

    virtual(x) <- value

### Arguments

`x` | a ff or ram object
`value` | a list with named elements
`...` | further arguments

### Details

ff objects have physical and virtual attributes, which have different copying semantics: physical attributes are shared between copies of ff objects while virtual attributes might differ between copies. `as.ram` will retain some physical and virtual atrributes in the ram clone, such that `as.ff` can restore an ff object with the same attributes.

### Value

`physical` and `virtual` returns a list with named elements

### Author(s)

Jens Oehlschlägel

### See Also

`physical.ff`, `physical.ffdf`

### Examples

      physical(bit(12))
      virtual(bit(12))

[Package bit version 4.0.4 Index]