R: Test for symmetric structure

symmetric {ff} | R Documentation

## Test for symmetric structure

### Description

Check if an object is inherently symmetric (its structure, not its data)

### Usage

    symmetric(x, ...)
    ## S3 method for class 'ff'
    symmetric(x, ...)
    ## Default S3 method:
    symmetric(x, ...)
    ## S3 method for class 'dist'
    symmetric(x, ...)

### Arguments

`x` | an ff or ram object
`...` | further arguments (not used)

### Details

ff matrices can be declared symmetric at creation time. Compatibility function `symmetric.default` returns FALSE, `symmetric.dist` returns TRUE.

### Value

TRUE or FALSE

### Author(s)

Jens Oehlschlägel

### See Also

`symmetric`, `ff` , `dist`, `isSymmetric`

### Examples

      symmetric(matrix(1:16, 4, 4))
      symmetric(dist(rnorm(1:4)))

[Package ff version 2.2-13 Index]