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% Computes the value of a continued fraction of the form
a0
----------------------
b0 - a1
-----------------
b1 - a2
------------
b2 - a3
-------
b3
The maximum accuracy depends on the size of a and b. tol is only
used for early termination of the series.
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Form:
x = CFract( a, b, tol )
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Inputs
------
a a array
b b array
tol Error tolerance
-------
Outputs
-------
x value of fraction
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References: Battin, R. H., An Introduction to the Mathematics and
Methods of Astrodynamics, AIAA, 1987, pp. 67-68.
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