.. highlightlang:: us

.. _cov:

cov
===

.. index:: cov

.. us.tag  cov ENGLISH New5120

:ref:`cov` returns the covariance of its parameter.

.. function::  rsCov = cov(rvX)
    rsCov = cov(rvX, rvY)

.. us.return

**Return Value**

*rsCov* is the covariance.

.. us.params

**Parameters**

.. uparam:: rvX

   *rvX* is a real vector.

.. uparam:: rvY

   *rvY* is a real vector.

.. us.example

**Example**

::

   * cov([-2,3,1])
     6.3333

.. us.history

**History**

.. list-table::
   :header-rows: 1

   * - Version
     - Description
   * - 5.12.0
     - New

.. seealso::
   :ref:`overview-mathematic`,
   :ref:`sum`,
   :ref:`mean`,
   :ref:`std`,
   :ref:`corrcoef`

:sub:`id-845731`