Arrows in Polar Matplotlib Plot

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I am trying to plot the phasors of the voltage across the resistor, capacitor, and inductor in an series R-L-C circuit. I have done all of the calculations and I can get a decent plot with just the normal ax.plot(theta,r,....).

I would like to make the phasor vectors look like arrows. I have been trying to use ax.arrow(0,0,theta,magnitude) but it looks like a line still. The gist to the code that I have written is here : GIST

My image that I create is

I tried to follow the example that I found on this list because it is very similar to what I want to accomplish, it produces the following image:

When I run their code on my computer I get

I am on Xubuntu 14.04 and running matplotlib 1.3.1. I do see that the example I am using was using matplotlib 0.99 in 2009.

Any help would be much appreciated.

asked 47 secs ago

Jesse

86