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Mike
Have you developed a library to facilitate financial system testing in
mathematica.
If so I am very interested to learn more about what you did since I am
considering this route myself.
Jerry
> -----Original Message-----
> From: MikeSuesserott [mailto:MikeSuesserott@xxxxxxxxxxx]
> Sent: Saturday, July 28, 2001 6:52 PM
> To: Bob Fulks; omega-list@xxxxxxxxxx
> Subject: AW: TradeStation Precision - Summary
>
>
> Bob,
>
> the problems you indicate are real, and have been the reason for me to
> totally abandon TS in 1999 in favor of Mathematica. I now do all of my
> testing and developing in this extremely versatile language, with no
> inclination of ever returning to EL again.
>
> Here is what I posted on this list on April 12, and you may
> see from this
> that I am in full agreement with your analysis:
>
> "As far as Mathematica is concerned ..., the language actually has
> *arbitrary* floating point precision built-in, enabling you
> to specify the
> desired internal accuracy of a calculation. This is important
> because of the
> issue of floating-point error propagation. As you know this
> problem can lead
> to totally meaningless results which may be wrong in all places of the
> mantissa, and sometimes can even be several orders of
> magnitude away from
> reality.
>
> "It always surprises me when I see people use Metastock or
> Tradestation for
> calculation-intensive number crunching while being entirely
> at the mercy of
> the built-in accuracy, or lack of it, of these packages.
>
> "We had such a case some time ago on the Metastock list where
> one poster got
> into big arguments with Metastock support because the
> software would give
> him signals different from those he was getting with Excel. The reason
> turned out to be some decimal in a calculation which finally lead to a
> different result, caused by different floating-point
> implementations [single
> vs. double precision]. And these calculations were just simple Moving
> Averages, not Fourier analysis or the inverting of Hilbert matrices!
>
> "So this issue of accuracy is not to be taken lightly, IMHO."
>
> Best wishes,
>
> Michael Suesserott
>
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