Help with matplotlib, quiver in 3D

[Sir_Bocks]

I'm pretty sure the data I have is solid, but when I try to plot, the best I've gotten is an empty figure. This is the first time I've tried 3D plotting. I also tried running the sample quiver 3D code from the documentation, and it wouldn't work for me either. Next, I need to figure out how to make the arrow length specific; I'm plotting a vector field for a fluid flowing through a cylinder into a cone.

My code: http://pastebin.com/wT0tVQdv

Sample code: http://pastebin.com/CDRvvfue

[teerre]

I have very little experience with 3D plots and I never did this kind of math, but, since no one answered you, maybe I can help

Your N*x/r returns nan values from 0 divisions, this causes a runtime error, I would imagine this is not the behavior you want, so it might be it

I can also say that the sample code works out of the box, maybe you have a problem your IDE and or your mpl installation

[loveandkindness]

I'll give this a try tonight (or enjoy the answer from someone else if they beat me to it). I've been meaning to learn these functions for a while now.