R: trace

tr {OpenMx} | R Documentation

## trace

### Description

This function returns the trace of an n-by-n square matrix x, defined to be the sum of the elements on the main diagonal (the diagonal from the upper left to the lower right).

### Usage

    tr(x)

### Arguments

`x` | an input matrix. Must be square

### Details

The input matrix must be square.

### See Also

`vech`, `rvectorize`, `cvectorize`

### Examples

    tr(matrix(1:9, 3, 3))
    tr(matrix(1:12, 3, 4))

[Package OpenMx version 2.17.3 Index]