.Modelica.Math.atan3

Information

This function returns y = atan3(u1,u2,y0) such that tan(y) = u1/u2 and y is in the range: -pi < y-y0 ≤ pi.
u2 may be zero, provided u1 is not zero. The difference to Modelica.Math.atan2(..) is the optional third argument y0 that allows to specify which of the infinite many solutions shall be returned:

Note, for the default case (y0=0), exactly the same result as with atan2(..) is returned.

Interface

function atan3
  import Modelica.Constants.pi;
  extends Modelica.Math.Icons.AxisCenter;
  input Real u1 "First independent variable";
  input Real u2 "Second independent variable";
  input Modelica.Units.SI.Angle y0 = 0 "y shall be in the range: -pi < y-y0 <= pi";
  output Modelica.Units.SI.Angle y "Dependent variable y=atan3(u1, u2, y0)=atan(u1/u2)";
end atan3;