R: Test for symmetric numeric matrix

is.symmetric.matrix {matrixcalc} | R Documentation

## Test for symmetric numeric matrix

### Description

This function returns TRUE if the argument is a numeric symmetric square matrix and FALSE otherwise.

### Usage

    is.symmetric.matrix(x)

### Arguments

`x` | an R object

### Value

TRUE or FALSE.

### Note

If the argument is not a numeric matrix, the function displays an error message and stops. If the argument is not a square matrix, the function displays an error message and stops.

### Author(s)

Frederick Novomestky fnovomes@poly.edu

### References

Bellman, R. (1987). Matrix Analysis, Second edition, Classics in Applied Mathematics, Society for Industrial and Applied Mathematics.

### See Also

`is.square.matrix`

### Examples

    A <- matrix( c( 1, 2, 3, 4 ), nrow=2, byrow=TRUE )
    is.symmetric.matrix( A )
    B <- matrix( c( 1, 2, 2, 1 ), nrow=2, byrow=TRUE )
    is.symmetric.matrix( B )

[Package matrixcalc version 1.0-3 Index]