ACCEPTED SOLUTION
Accepted Solutions
This is also a very elegant solution. See its implementation for my current example it worked very fine. However I miss the colorful diagram from Alan's method 
Is it possible here to assign different colors to different vectors?
I also find the arrowhead in Alan's method finer. Is it possible to change the shape of the arrowheads here? I tried to manipulate the values in AHd but didn't help.
I also find the arrowhead in Alan's method finer. Is it possible to change the shape of the arrowheads here? I tried to manipulate the values in AHd but didn't help.
According to scaling the size see Richards answer.
If you think (like me) that narrower arrows would look better, you have to change the the -0.5+/-0.3i to somethings else, e.g. ratio 7:1, in the definiton of AHd, I personally prefer switching the last two elements in that vector, too, making up kind of a "full" arrow..
So you are not looking for a polar plot, you just want to draw a few arrows given by magnitude and phase.
As you already learned in this thread, Prime does not offer away to easily draw vectors, so we have to write our own routines.
Richard already provided a way to do it in his answers to the original question - whats wrong with it in your opinion? Maybe you are not aware that you can define complex numbers using the versor notation (menu ribbon "Calculate", "Operators").
All thats left to do now is to scale the arrows according to the dimensions of your plot (AHdSize) and take care that both axis are scales approximately the same to avoid distortions of the arrows.
Here is your example and I just used Richards solution as given by him above. The difference vector was made a separate plot to be able to color it differently.
Sure, you won't have the scaling problem when using a polar plot, but then the illustration might get too tiny as you are forced to use the full circle. Prime's suitability for illustrations is unfortunately very limited.
You can use the very same approach as shown above with a polar plot, too. Instead of "Re" and "Im" you use the magnitude (absolute value, |..|) and the phase ("arg" function) at the appropriate place holders. Furthermore you have to vectorize the function calls, otherwise "|voltages|" would return a single scalar value - the magnitude of the vector voltages, instead of a vector of multiple magnitudes.
We also have to redefine Prime's "arg" function to not throw an error if the argument is zero. Prime is mathematically correct in this respect as the phase of 0+0j IS undefined, but for our purpose its better to set the phase to 0 in that case.
Prime 6 worksheet attached.
