I have all this working the same way as Massimo suggested with matplotlib, no 
problems.

But, I can't for the life of me figure out how to pass a variable into the 
controller plot function from the view.  This would be so I can, for example, 
ask the user to choose a variable through a form and then produce a histogram 
of that variable with matplotlib.  Right now I have it working but only if the 
variable for the histogram is preset in the controller plot function.

I tried to set the variable with request.vars like so:

<img src="{{=URL(f='myplotfunction', vars=dict(myvar=userselectedvar))}}"/>

And then simply use request.vars.myvar in the function:

def myplotfunction():
    ...
   return ...

Where am I going wrong?  I am misunderstanding syntax or how request.vars works?

I would appreciate any help.

- Josh

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