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Re: [amibroker] String Manipulations



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Ken,

I should point out that this only works for a single pass of AFL.  Since you are likely wanting the variables of your trades to be more persistent, they would likely be in disk files or at least in static variables.  So the code given below would at least be changed to StaticVarGetText(...

BR,
Dennis

On Sep 19, 2008, at 1:46 PM, Dennis Brown wrote:

Ken,

This is quite easy by using the StrExtract( list, item) function.  I am doing some similar things in the AFL I am writing for the AFL Glossary project.

Typing this off the top of my head to give you the basic idea:

For( i=1;  i < totalSymbolCount;  i++ ) 
{
list = VarGetText( "H" + NumToStr(i, 1.0, 0);
SymList = SymList + "," + StrExtract( list , 0);
ShrList = ShrList + "," + StrExtract( list, 1);
DatList = DatList + "," + StrExtract( list, 2);
}

BR,
Dennis

On Sep 19, 2008, at 12:53 PM, Ken Close wrote:

I have tried various constructions to achieve the following, but the code gets complex and has no good way of detecting end of string.
 
I would like to take a series of strings, H1, H2, H3, and create lists of the elements, as such
 
H1    =    "SPY,500,06/04/2008";
H2    =    "DIA,100,09/02/2008";
H3    =    "QQQQ,300,08/04/2008";
 
and turn them into these three lists
 
SymList    =    "SPY,DIA,"QQQQ";
ShrList    =    "500,100,300";
< span class="453144116-19092008">DatList    =    "06/04/2008,09/02/2008,08/04/2008";
 
Hx strings would be hard coded into the overall afl although one could set up a variety of paramtxt statements to enter them. 
 
Seems like it would be somewhat easy (and maybe it is), but I get bogged down in switch/case statements, or complex if/else statements.
 
Anyone see a more simple way to arrange the strings.
 
My ultimate goal is to have a list of "holdings" and some simple statistics displayed.
AA window with a Watchlist seems obvious--yes?--but I need to have multiple positions of the same symbol, and I do not think you can put multiples of the same symbol in a watchlist--same symbol with different shares purchased on different dates-- (is there a way?).
 
I next tried dynamic variables, in order to manipulate symbols and their associated price statistics, but that bombed.
 
So now I am attempting to display my list of holdings in a Gfx title statement.
I successfully have it displayed, but using long strings, like above for the SymList, ShrList, and DatList.  This gets unmanageable when the number of symbols gets large and you try, by eye, to coordinate the dates and shares.
 
Thus, I was hoping to list a three element string reprenting each holding and then rearrage them into long string lists.
 
any ideas?
 
thanks.

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