# Trace of a matrix

### Description

Returns the trace of a matrix

### Usage

1 | ```
tr(a)
``` |

### Arguments

`a` |
Matrix whose trace is desired |

### Author(s)

Robin K. S. Hankin

### Examples

1 |

Returns the trace of a matrix

1 | ```
tr(a)
``` |

`a` |
Matrix whose trace is desired |

Robin K. S. Hankin

1 |