Block that outputs the tangent-inverse y = atan2(u1,
u2) of the input u1 divided by the input
u2.
u1 and u2 shall not be zero at the
same time instant. Atan2 uses the sign of
u1 and u2 in order to construct the
solution in the range -π ≤ y ≤ π, whereas IDEAS.Controls.OBC.CDL.Reals.Atan
gives a solution in the range -π/2 ≤ y ≤ π/2.

final keyword to unit declaration as block is
only valid for this unit.displayUnit keyword.rad to the output.