Hello,

        Let's say a probability vector of dimension d is x_1, ..., x_d, where 
each one is a non-negative term, and they all sum up to 1. Now I'd like 
to iterate over all probability vectors, but this is impossible, since 
they're uncountable. So instead, let's say I want to iterate over all 
such vectors under the constraint that the granularity of each component 
is at most some delta.

        To make things pythonesque, here's the interface:
<interface>
class simplex:
        def __init__(self, dim, delta):
                ...
                
        def __iter__(self):
                ...
                
        def next(self):
                ...
</interface>    
        
        The problem is, what's a fast implementation? I tried something simple, 
and it is slooooooooooooow. If anyone can think of something clever, I'd 
love to hear it.

        Many Thanks,

        Efrat
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