[amibroker] Nested For-Loop problems

["nmolchanoff" <knowing@xxxxxxxxxxx>]

Hello,

I was having a problem with an exploration that utiliized a nested 
for-loop.  After much trouble-shooting, I realized that the body of 
my code inside the loop was fine; it executes perfectly when not in 
the loop.

So I then tried to do just a simple test loop like this:


for( i = BarCount - per ; i < BarCount-1; i++ ) {
    for( j=0.850; j<=0.950; j= j+0.001 ) {
	AddColumn(i, "I", 1.0);
	AddColumn(j, "J", 1.3);
    }
}

And it crashes the system...  It crashes as soon as I hit "Explore" 
or "Check."

If I separate the two loops, they both execute perfectly,  but as 
soon as I nest them: Wham! Down she goes.

Anyone know what might be causing this?


Here is a copy of the crash dump and full source code:

Crash Dump:
------------------------------------------------------------------

AmiBroker version 4.44.0
 ( cooltool.dll 4.44.0,  mfc42.dll 6.0.8665,  msvcrt.dll 6.1.8924 )

Microsoft Windows 2000 version 5.0 (Build 2195)
Service Pack 2.0
Common Controls: 5.81

Unhandled exception
Type:	CSysException
Code:	c0000005
Description:	ACCESS VIOLATION
Address:	447456

		AddColumn(i, "I", 1.0);

		AddColumn(j,"J", 1.3);

	}

}
^

(occurred during AFL formula execution)

AFL Parser status:
Processing stage: EXECUTE
Formula ID: 0 ()
Action 5 (BACKTEST)

Additional information:

Number of stock loaded: 25388
Currently selected stock: GENR
Number of quotes (current stock): 2511

Workspace:
Data source = (default), Data local mode = 0, NumBars = 2600

Preferences:
Data source = QP2 , Data local mode = 1, NumBars = 2600

Command history:
2828 - Shows Analyser - a tool to test systems & explore market--Auto-
Analyser

Cache manager stats:
Number of list elements: 3
Number of map elements: 3
Hash table size: 5987

Memory status:
  MemoryLoad: 53 %
  TotalPhys:       261668K  AvailPhys:       120372K
  TotalPageFile:  1288600K  AvailPageFile:  1112636K
  TotalVirtual:   2097024K  AvailVirtual:   1862540K

Last Windows message:
HWnd:	0x1402ce
Msg:	0x0110
wParam:	0x000f03e2
lParam:	0x00000000




Complete Source:
------------------------------------------------------------------


per = 65;

MAvol = MA(V, per);

Minvol = 100000;

MinPrice = 1.00;

MaxPrice = 30.00;

MinIrc = 2;

R1 = ATR(per);

irc = (r1/C)*100;

L1 = Ref(L, -1);

C2 = Ref(C, -2);

breakeven = 0.01;

Filter = (BuyPrice >= MinPrice) AND (BuyPrice <=MaxPrice) AND (V >= 
Minvol) AND (MAvol >= Minvol) AND (irc >= MinIrc);

AddTextColumn(FullName(),"Name");

AddColumn(MarketID(0), "Mkt", 1.0);

AddTextColumn(MarketID(1), "Market");

AddColumn(SectorID(0), "Sectr", 1.0); 

AddTextColumn(SectorID(1), "Sector"); 

AddColumn(IndustryID(0), "Ind", 1.0);

AddTextColumn(IndustryID(1), "Industry");

AddColumn(C, "Price", 1.2);

AddColumn(MAvol/1000, "Vol/K", 1.0);

AddTextColumn(Name(), "Ticker");

AddColumn(R1, "1R", 1.2);

AddColumn(irc, "1R/C", 1.2);

AddColumn(per, "per", 1.0);




for( i = BarCount - per ; i < BarCount-1; i++ ) {

	for( j=0.850; j<=0.950; j= j+0.001 ) {
		AddColumn(i, "I", 1.0);
		AddColumn(j,"J", 1.3);
	}
}



/*

for( i = BarCount - per ; i < BarCount-1; i++ ) {

    for( j=0.850; j<=0.950; j= j+0.001 ) {

        AddColumn(Sum(IIf((L1[i] < C2[i]* j) AND (Filter[i] ), 1, 
0),per), "Trades" + j, 1.0);

        AddColumn(Sum(IIf((L1[i] < C2[i]* j) AND (Filter[i] ) AND (O
[i]/(C2[i]* j)-1 > breakeven), 1, 0),per), "Wins" + j, 1.0);

        AddColumn(Sum(IIf((L1[i] < C2[i]* j) AND (Filter[i] ) AND (O
[i]/(C2[i]* j)-1 > breakeven), 1, 0),per)/ Sum(IIf((L1[i] < C2[i]
*0.850) AND (Filter), 1, 0),per), "Win%" + j, 1.2);

        AddColumn(Sum(IIf((L1[i] < C2[i]* j) AND (Filter[i] ), ((O[i]/
(C2[i]* j)-1)*100), 0),per), "Net%" + j, 1.2);

    }

}
*/

------------------------------------------------------------------

Thanks in advance for any Ideas or Suggestions.


Regards,

Nick Molchanoff





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