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

### Examples

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

[Package

*OpenMx*version 2.21.11 Index]