[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: Precision and MS calculations



PureBytes Links

Trading Reference Links

Steve,

Lost that darn beer again.  Probably skunky by now.

I'll be in "D" next Thursday for 4 days visiting my folks.  I'll toss down a
couple of coney islands down for you as well.  :)



Guy

Never be afraid to try something new. Remember, amateurs built the ark,
professionals built the Titanic.

-----Original Message-----
From: owner-metastock@xxxxxxxxxxxxx [mailto:owner-metastock@xxxxxxxxxxxxx]On
Behalf Of Steve Karnish
Sent: Friday, August 25, 2000 6:04 AM
To: metastock@xxxxxxxxxxxxx
Subject: Re: Precision and MS calculations

Guy,

Too much Stroth's beer at an early age.

Steve Karnish
Cedar Creek Trading
http://www.cedarcreektrading.com
----- Original Message -----
From: Guy Tann <grt@xxxxxxxxxxxx>
To: Metastock User Group <metastock-list@xxxxxxxxxxxxx>
Sent: Thursday, August 24, 2000 9:11 PM
Subject: Precision and MS calculations


> List,
>
> Well I gave up and went back to square one.  I couldn't figure out how a
> variable could calculate correctly from 12/11/99 to 8/9/00 and then fail
the
> next day and then work correctly again.  First I wrote 7 Clipper programs
> which I used to print out each variable.  I checked my MS calculations for
> each variable against these printouts.  The first 8 variables calculated
> correctly.
>
> The ninth variable didn't!  What was weird was that every day calculated
> correctly until the 2nd day from the end.  I double-checked the inputs and
> they were in complete agreement (I exported my MS data into Clipper to
> insure both systems that were using the same data).  I then went back and
> double-checked each value that was part of this calculation.  One of my
> variables was off slightly for one of these days.  I went back and recoded
> my MS code and broke the calculation into 6 steps to equal the code in the
> Clipper program.  So now I have identical code in both modules and you
would
> think that the results would be identical.  Wrong, buckwheat!
>
> For the life of me, I'm at a loss.  It's probably something to do with MS
> and precision, but in this case, following rounding, I use Int() to
capture
> only the whole number and drop any fractions.  If anyone has a suggestion,
> I'm open to it.  Our numbers are too sensitive to not be able to trust the
> results of a simple calculation.  If this was a complex calculation, I
might
> possibly understand a variance.  In this case the correct answer is -3
(and
> yes, I did calculate it manually to make sure) while MS came up with -2.
> I think I'm going to take a day off and clear my head.  This is why I get
so
> frustrated trying to use MS.  How could a program calculate correctly for
> 99.994% of the time and then blow it on that one day?
> Tomorrow, I'm planning on printing out the intermediate results from both
> Clipper and MS to see if I can see where this thing is going wrong.  I'm
too
> tired tonight.
>
> I need a break.  Where did I put that beer?
>
> Guy
>
> Never be afraid to try something new. Remember, amateurs built the ark,
> professionals built the Titanic.
>





  • Follow-Ups:
    • Beer
      • From: Lionel Issen