|
PureBytes Links
Trading Reference Links
|
How many bits are your numbers?
Two 11 bit integers can be be packed and unpacked from one 32 bit
float number with ease. You just mask (&) bits to extract the low
order number. Use multiply or divide to shift the low to the high
half of the number and back to the low half again. Simple bit
arithmetic.
Though it seems there should be easier ways to get what you want. I
am not a CBT user though.
BR,
Dennis
On Feb 7, 2009, at 7:57 PM, hydroblue@xxxxxxxxxxxxxx wrote:
> Thanks Tomasz. I'm looking for a clever way to stuff two numbers into
> the 32 bit float and then later extract the 2 numbers.
>
> // fraction = 23 bit integer
> // exponent = 8 bit integer
>
> The reason for doing this is to efficiently get an extra array of
> numbers into the portfolio backtester without thousands of static vars
> or Foreign symbols.
>
> Is there a way to do this in AFL without writing a DLL?
>
> --- In amibroker@xxxxxxxxxxxxxxx, "Tomasz Janeczko" <groups@xxx>
> wrote:
>>
>> Hello,
>>
>> IEEE 754 Standard floating point (32 bit, single precision)
>> http://en.wikipedia.org/wiki/IEEE_754-1985
>>
>> Best regards,
>> Tomasz Janeczko
>> amibroker.com
>> ----- Original Message -----
>> From: <hydroblue@xxx>
>> To: <amibroker@xxxxxxxxxxxxxxx>
>> Sent: Saturday, February 07, 2009 5:13 PM
>> Subject: [amibroker] AFL floating point number representation?
>>
>>
>>> I need to know what range of values and what precision can be
>>> represented in the AFL floating point arrays, specifically the
>>> PositionSize array.
>>>
>>> It would also be useful to know how many bits are available in the
>>> mantissa and exponent. Any help appreciated.
>>>
>>> Thanks,
>>> Steve
>>>
>>>
>>>
>>> ------------------------------------
>>>
>>> **** IMPORTANT ****
>>> This group is for the discussion between users only.
>>> This is *NOT* technical support channel.
>>>
>>> *********************
>>> TO GET TECHNICAL SUPPORT from AmiBroker please send an e-mail
> directly to
>>> SUPPORT {at} amibroker.com
>>> *********************
>>>
>>> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
>>> http://www.amibroker.com/devlog/
>>>
>>> For other support material please check also:
>>> http://www.amibroker.com/support.html
>>>
>>> *********************************
>>> Yahoo! Groups Links
>>>
>>>
>>>
>>
>
>
>
>
> ------------------------------------
>
> **** IMPORTANT ****
> This group is for the discussion between users only.
> This is *NOT* technical support channel.
>
> *********************
> TO GET TECHNICAL SUPPORT from AmiBroker please send an e-mail
> directly to
> SUPPORT {at} amibroker.com
> *********************
>
> For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> http://www.amibroker.com/devlog/
>
> For other support material please check also:
> http://www.amibroker.com/support.html
>
> *********************************
> Yahoo! Groups Links
>
>
>
------------------------------------
**** IMPORTANT ****
This group is for the discussion between users only.
This is *NOT* technical support channel.
*********************
TO GET TECHNICAL SUPPORT from AmiBroker please send an e-mail directly to
SUPPORT {at} amibroker.com
*********************
For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
http://www.amibroker.com/devlog/
For other support material please check also:
http://www.amibroker.com/support.html
*********************************
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/amibroker/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/amibroker/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:amibroker-digest@xxxxxxxxxxxxxxx
mailto:amibroker-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
amibroker-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
|