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Hello,
Check the archives before starting again and again the same thread.
Was discussed already many many times here.
The floating precision is determined by INTERNATIONAL STANDARD
IEEE-754 standard for 32-bit floating point: 7 significant digits:
http://en.wikipedia.org/wiki/IEEE_floating-point_standard
http://babbage.cs.qc.edu/courses/cs341/IEEE-754hex32.html
http://babbage.cs.qc.edu/courses/cs341/IEEE-754references.html
Use this:
printf("Low is %g", L );
or simply:
"Low is " + L;
and you will get 38.78
Best regards,
Tomasz Janeczko
amibroker.com
----- Original Message -----
From: "giggollo99" <giggollo@xxxxxxxxxxx>
To: <amibroker@xxxxxxxxxxxxxxx>
Sent: Wednesday, August 24, 2005 8:28 AM
Subject: [amibroker] Floating point precision (or lack thereof)
> Hi all,
>
> When i display values in commentary window like High, Low etc, I'm
> seeing values which appear to be imprecise. For example, my downloaded
> data contains a low of 38.78 for a particular bar, but when I display
> the value in Commentary window to 8 decimal places i get:
>
> L=38.77999878
>
> This causes problems in backtesting because if i code this condition
>
> IIF(L<38.78,X,Y)
>
> the code will yield X when in fact it should yield Y because the low
> is not less than 38.78 (it is exactly 38.78). This occurs simply
> because of the imprecise representation of the value in AB.
>
> Does anyone know how to get around this, and if its normal for the
> value to be imprecise in AB?
>
> Thanks a lot,
> g
>
>
>
>
>
>
> Please note that this group is for discussion between users only.
>
> To get support from AmiBroker please send an e-mail directly to
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>
> For other support material please check also:
> http://www.amibroker.com/support.html
>
>
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