.. highlightlang:: us

.. index:: atan2

.. _atan2:

atan2
=====

.. us.tag  atan ENGLISH

:ref:`atan2` calculates the four-quadrant inverse tangent.

.. function::  r = atan2(y, x)

.. us.return

**Return Value**

*r* is the arctangent of *y*/*x* in the range [−π, π].

 .. us.params

**Parameters**

.. uparam:: y

   *y* is a real matrix. The size must be identical as *x*.

.. uparam:: x

   *x* is a real matrix.

.. us.example

**Example**

::

   * atan2(2,1)
   1.1071

.. seealso::
   :ref:`overview-mathematic`,
   :ref:`atan`,
   :ref:`tan`

:sub:`id-1338511`