.. highlightlang:: us

.. index:: cond

.. _cond:

cond
====

.. us.tag  cond NOTREADYENGLISH math-lin-alg

:ref:`cond` calculates the condition number of a matrix.

.. function::  rsCond = cond(m)

.. us.return

**Return Value**

*rsCond* is the condition number.

.. us.params

**Parameters**

.. uparam:: m

   *m* is a real or complex matrix.

.. us.example

**Example**

::

   * norm(hilb(10)) * norm(hilb(10)^-1)
   3.535e+013
   * cond(hilb(10))
   3.535e+013
   * rcond = 1/cond(hilb(10))
   * printf("%e\n%e\n", rcond, _eps);
   2.828556e-14
   2.220446e-16

.. us.comment

**Comment**

The condition number of a matrix measures the sensitivity of the solution of a
system of linear equations to errors in the data. It gives an indication of the
accuracy of the results from matrix inversion and the linear equation solution.

.. seealso::
   :ref:`overview-mathematic`,
   :ref:`norm`,
   :ref:`hilb`

:sub:`id-783354`