VectorAssignPolar
The VectorAssignPolar function requires 2 parameters (for 2D vectors) or 3 parameters (for 3D vectors). This function must be placed after the $Vector (or $Vector2D) directive that identifies a vector variable.
The first parameter is the magnitude of the vector. The second parameter is the angle between the positive x-direction and the vector. For 3D vectors, a third parameter is required, which is the angle between the positive y-direction and the vector. The angles should be provided in degrees or radians depending on the units for that have been set for angles. See $UnitSystem.
EES variables and algebraic expressions may be provided for the components as shown in the following examples.
$Vector A B C
$UnitSystem Deg
A=VectorAssignPolar(1 [m], 30 [deg], 70 [deg])
x=30 [deg]
y=70 [deg]
Mag=1 [ft]
B=VectorAssignPolar(Mag,x,y) [ft]
Units may be defined with the VectorAssign function in two ways. The units may be provided with the Magnitude, provided that it is a numerical value, as shown above for vector A. In the example above, the units of EES variables A_x, A_y, and A_z will all be set to [m].
Alternatively, units may be specified by following the VectorAssignPolar function with the units, as shown above for vector B. In this case, the units of B_x, B_y and B_z will be set to [ft].
The VectorAssignPolar function may be followed by multiplication/division with a scalar or addition/subtraction of a vector.
C=VectorAssignPolar(Mag,x,y)/4+2*A
See also: VectorAssign