>> PS. Annoying that I have to put the underscores on those variable 
>> names... grrr!
> 
> 
> Use Upercase then you don't need those underscores.

The idea is to use upercase for vectors and lowercase for scalars...

But yes, that would also work of course.

Andrew.

(I understand not being able to use "x", "y" and "z", but "t"? That's 
not even *valid* as a token by itself...)

Also vaguely irritating is the need to wrap Boolean assignments with 
brackets, but still...

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