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RE: [amibroker] Ticker Symbol Length Issues



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Tomasz,

 

I was afraid that it would be a big issue.    

 

Regarding using the Full Name, I like the idea and it IS technically feasible in my code, BUT…

 

Using the Full Name is NOT logistically feasible (AFAIK).  The key problem (in this case, it’s a “Big Problem”) is the combination of:

 

1.       The need to map one symbol to another through the Full Name, and

2.       The inability to programmatically set the Full Name for a symbol.

 

I.e., according to the documentation, the Full Name would have to be entered manually.  

 

Currently, even at the immature state of my system development, I’ve created 807 composite symbols.   Over the next several weeks when I test ideas, I expect this number to grow by a factor of 3 to 5 – 2,000 to 4,000 thousand symbols.

 

Manually entering the Full Name for thousands of symbols is simply not feasible. 

 

How can the Full Name be programmatically entered during a scan when the Composite symbol is created?

 

Regards,

 

Dan.

 


From: amibroker@xxxxxxxxxxxxxxx [mailto:amibroker@xxxxxxxxxxxxxxx] On Behalf Of Tomasz Janeczko
Sent: Sunday, August 14, 2005 1:35 AM
To: amibroker@xxxxxxxxxxxxxxx
Subject: Re: [amibroker] Ticker Symbol Length Issues

 

Hello,

 

Symbol length is 25 characters and won't be changed now because it would mean change of core symbol record,

which would mean that databases between versions are not compatible, so you would not be able to use database

created with say version 4.80 in version 4.70 or earlier. Not to mention amount of work required plus the fact

that will break some of existing plugins.

 

Instead, I suggest usign numerical encoding of industries: it will take just 3 digits

 

~iInd_012

~iInd_013

 

And use full name field to store "human-readable" description of composite you are creating - so you will be able

to see it in the tooltip.

Full name is 64 characters.

 


Best regards,
Tomasz Janeczko
amibroker.com

----- Original Message -----

From: Dan Clark

Sent: Sunday, August 14, 2005 8:11 AM

Subject: [amibroker] Ticker Symbol Length Issues

 

Hi,

 

I’ve discovered the joys of Composite symbols.  However…

 

I ran into what appears to be a serious issue when creating Composite symbols – ticker symbol length.  It appears that the maximum length for a ticker symbol is 25 characters.

 

When creating Composite symbols, you append or prepend a character string to differentiate types of Composite symbols.  If the first 25 characters of a Composite symbol are exactly the same, the excess characters are truncated and values are merged to one symbol.  The symbol is then corrupt.

 

For example, I create QP Industry Composite indexes of my stock list, and then create an “Indicator” Composite symbol of each Industry Index symbol.  Here’s how the error occurs:

 

·         QP has two Industries:

Aerospace-Defense

Aerospace-Defense Eqp

 

·         Composite Industry indexes are created by prepending “~iInd_” to the industry name:

~iInd_Aerospace-Defense

~iInd_Aerospace-Defense E

 

Notice that “qp” is truncated from the second industry.

 

·         Then Composite Indicator symbols are created by prepending “Rk” to the Industry Index symbols:

“Rk~iInd_Aerospace-Defense”

 

However, instead of two Composite Indicator symbols, only ONE is created!  Since the left 25 characters of the Indicator Composite symbol (“Rk” + Industry Index symbol name) are same for both Industries, values from the two Industry Index symbols are merged to one Indicator Symbol!

 

Composite Indexes and Indicator symbols are a HUGE benefit.  Composite Indicator symbols allow me to preprocess and save Indicators like RSI, and then use them like a normal ticker.    Before, my scans and charts computed Sector and Industry Rank on the fly, which was SLOW!  Now, with Sector and Industry Composite Rank symbols, scans and charts are at least 3 times faster!  

 

How can I get around this character length limitation?    Tweaking symbol names might work for a while, but at some point the symbol names will become meaningless.   Can I increase the Symbol length?  Tomasz, can you increase Symbol length?

 

Thanks and regards,

 

Dan.

 

 



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