Home
Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
Reference Guide for OpenMatrix Language Functions
The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
Trigonometry Commands
atan2d
Returns the four quadrant inverse tangent (in radians) for each element pair of the arguments.

Welcome
What's New
Discover new features and enhancements.
Get Started
Discover Compose, including its language support and system requirements.
Tutorials
The Compose tutorials and associated example model files help introduce you to the basic functionality of the software.
User Guide
Learn about the features and functionality available in Compose.
Reference Guides
Reference guides are available for functions and commands supported by OML, Tcl, and Python.
- Scripting Guide for OpenMatrix Language
  OpenMatrix is a mathematical scripting language.
- Reference Guide for OpenMatrix Language Functions
  The Reference Guide contains documentation for all functions supported in the OpenMatrix language.
  - ABF Commands
  - Altair Integration Commands
  - Audio Commands
  - CAE Commands
  - CAE Reader Commands
  - CAE Reader 3D Commands
  - CAE Writer Commands
  - Calculus Commands
  - Computer Vision Commands
  - Communication Commands
  - Control System Commands
  - Core Minimal Interpreter Commands
  - Data Structure Commands
  - Differential Equations Commands
  - Elementary Math Commands
  - File I/O Commands
  - Geometry Commands
  - GUI Commands
  - HDF5 Reader Commands
  - HDF5 Writer Commands
  - hstpyfit Commands
  - Image Commands
  - JSON Commands
  - Library Manager Commands
  - Linear Algebra Commands
  - Logical Commands
  - Machine Learning Commands
  - Optimization Commands
  - Plotting Commands
  - PSIM Commands
  - Polynomial Math Commands
  - Signal Processing Commands
  - Special Functions Commands
  - Statistical Analysis Commands
  - String Operations Commands
  - System Commands
  - Table Commands
  - Tcl Bridge OML Commands
  - Tcl Bridge Tcl Commands
  - Time Commands
  - Trigonometry Commands
    - acos
      Returns the inverse cosine (in radians) for each element of the argument.
    - acosd
      Returns the inverse cosine (in degrees) for each element of the argument.
    - acosh
      Returns the inverse hyperbolic cosine (in radians) of a.
    - acot
      Returns the inverse cotangent (in radians) for each element of the argument.
    - acotd
      Returns the inverse cotangent (in degrees) for each element of the argument.
    - acsc
      Returns the inverse cosecant (in radians) for each element of the argument.
    - acscd
      Returns the inverse cosecant (in degrees) for each element of the argument.
    - asec
      Returns the inverse secant (in radians) for each element of the argument.
    - asecd
      Returns the inverse secant (in degrees) for each element of the argument.
    - asin
      Returns the inverse sine (in radians) for each element of the argument.
    - asind
      Returns the inverse sine (in degrees) for each element of the argument.
    - asinh
      Returns the inverse hyperbolic sine (in radians) of a.
    - atan
      Returns the inverse tangent (in radians) for each element of the argument.
    - atan2
      Returns the four quadrant inverse tangent (in radians) for each element pair of the arguments.
    - atan2d
      Returns the four quadrant inverse tangent (in radians) for each element pair of the arguments.
    - atand
      Returns the inverse tangent (in degrees) for each element of the argument.
    - atanh
      Returns the inverse hyperbolic tangent of a.
    - cos
      Returns the cosine for each element of the argument (in radians).
    - cosd
      Returns the cosine for each element of the argument (in degrees).
    - cosh
      Returns the hyperbolic cosine of a (input in radians).
    - cot
      Returns the cotangent for each element of the argument (in radians).
    - cotd
      Returns the cotangent for each element of the argument (in degrees).
    - csc
      Returns the cosecant for each element of the argument (in radians).
    - cscd
      Returns the cosecant for each element of the argument (in degrees).
    - deg2rad
      Converts degrees to radian values.
    - hypot
      Returns the element-wise square root of the sum of the squares of x and y.
    - rad2deg
      Converts radian values to degrees.
    - sec
      Returns the secant for each element of the argument (in radians).
    - secd
      Returns the secant for each element of the argument (in degrees).
    - sin
      Returns the sine for each element of the argument (in radians).
    - sind
      Returns the sine for each element of the argument (in degrees).
    - sinh
      Returns the hyperbolic sine of a (input in radians).
    - tan
      Returns the tangent for each element of the argument (in radians).
    - tand
      Returns the tangent for each element of the argument (in degrees).
    - tanh
      Returns hyperbolic tangent of a.
  - OML to Python Bridge Commands
  - Python to OML Bridge Commands
- Python in Compose Reference Guide
Appendix
Get help for the optional libraries that are available in the Extension Manager.
Frequently Asked Questions
You've got questions? We've got answers!

atan2d

Returns the four quadrant inverse tangent (in radians) for each element pair of the arguments.

Syntax

R = atan2d(y,x)

Inputs

y: The opposite leg of a triangle.; Dimension: scalar | vector | matrix
x: The adjacent leg of a triangle.; Dimension: scalar | vector | matrix

Outputs

R: The angle result (in degrees).

Examples

Scalar inputs:

R = atan2d(1,-sqrt(3))

R = 150

Matrix inputs:

R = atan2d([2,-3;4,-5],[-3,4;5,-6])

R = [Matrix] 2 x 2
  146.30993   -36.86990
  38.65981  -140.19443