Hello all,

I have been spending my time making 
http://qutip.org/docs/3.1.0/guide/guide-bloch.html work in Julia by 
translating the main parts of the source code 
http://qutip.org/docs/3.1.0/modules/qutip/bloch.html 
. <http://qutip.org/docs/3.1.0/modules/qutip/bloch.html>

In short, what I've worked out is, in pseudo-code:

type Bloch
   some properties.. :: of various types
   vectors ( :: Vector{Vector{Float64}}  ) # Vector of vectors that can be 
plot on the sphere.
end

Bloch() = Bloch(standard properties, []) # initialize without any vectors 
to plot

function add_vector(b::Bloch,vector::Vector{Float64})
   push!(b.vectors,vector)
end

function render(b::Bloch)
  plot a sphere
  plot equator
  plot x,y and z axis
  plot vectors
  style axes
end

The actual code I've written so far can be found on 
https://github.com/whekman/edX/blob/master/Other/bloch.jl . Any advice on 
my code much appreciated, I`m quite new to programming.

Now *I`d love to make such rendering compatible with @manipulate*. I know 
that you can use withfig(fig) do .... end but somehow I cant figure out how 
to incorporate it in this more object style approach.

Basically, I'm looking for a way to implement, in pseudo-code:

b = Bloch()
@manipulate for azimuth 0:15:90, latitude -180:15:180
   add_vector(b,azimuth,latitude)
   render(b)
end

So the goal is to have an easy way to draw points on such a sphere in an 
interactive way. Basically, I am having a hard time figuring out how to 
combine the use of such a composite type with @manipulate.

Anyone know a solution?

As an aside, the PyPlot code that I've written so far may be a nice, 
comprehensive example of 3D plotting using PyPlot . If so, how to make sure 
people can find it?

Furthermore, any hopes of plotting Arrow3D objects from inside Julia? It is 
already possible in matplotlib 
http://stackoverflow.com/questions/29188612/arrows-in-matplotlib-using-mplot3d

- Willem

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