"Greg M. Johnson" wrote:
> 
> My algo has tens of thousands of vlength, trace, and Reorient operations.
> 
> Is it possible that the values one gets for any of these depends on what the
> computer has done before, say like at the 12th decimal?

Well, at least, from your description, you are creating the 2 conditions
of a chaotic system :
 - sensibility to initial values
 - iterative system

Think of the simplistic Lorenz system of 3 equations, it falls
so quickly into chaotic behaviour...

To check for a chaotic property of your system, you might want to
try to draw the phase diagram of some parts of your system.

Fabien.

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