` rc=rcond(a)`

Inputs | |

`a` |
A square matrix. |

Outputs | |

`rc` |
An estimate of the inverse of the condition number of `a` . |

As is well known, smaller the inverse condition number, the lower is the accuracy of the usual methods of solving the equation

`a*x=b`

, and
the results are quite sensitive to change in the values of the elements of
`b`

.