How To Correct This Mistake?

#1
The following AFL code has a mistake in Line 51. It says invalid argument for PDI() function. Argument range must be positive (and not null).
Can some one help?+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//------------------------------------------------------------------------------
//
// Formula Name: DMI Spread Index
// Author/Uploader: Steve Wiser
// E-mail: [email protected]
// Date/Time Added: 2001-07-05 19:13:58
// Origin:
// Keywords:
// Level: basic
// Flags: system,exploration,indicator
// Formula URL: http://www.amibroker.com/library/formula.php?id=59
// Details URL: http://www.amibroker.com/library/detail.php?id=59
//
//------------------------------------------------------------------------------
//
// Uses DMI Spread Index as a system, indicator and exploration
//
//------------------------------------------------------------------------------

/* Settings setup should have buy and sell at open with one day delay. I also use a 5%
maximum stop loss. This code also plots the DMI Index in its own chart pane. Note that I
have also provided a zero line for better viewing of the zero cross.*/

/* Exploration, System and Indicator
Author Steve Wiser
Email address: [email protected]
May 5, 2001 */

Percent=3;
pds=PeakBars(C,Percent,2)-PeakBars(C,Percent,1);
pds=LastValue(pds);

/* the following code is for the consolidation periods or better know
as the sleeping Alligator */

var3= 5;
var4= 3;
var10=10;
var0= Ref(Wilders(C,13),-8);
var1= Ref(Wilders(C,8),-5);
var2= Ref(Wilders(C,5),-3);
var5= MA((var0+var1+var2),var4) ;
angle=atan(var5-Ref(var5,-var3)/var3);
angle=IIf( angle >90,angle-360,angle);
hope=IIf( angle <20 AND angle>-20,1,0);
cry=((StDev(C,var3*2) - Ref(Wilders(StDev(C,var3*2),8),-5))/
(Ref(Wilders(StDev(C,var3*2),8),-5)))<0;

/* End of Sleeping Alligator which is an area of little or no volitlity or price movement.*/

SI=MA(PDI(pds)-MDI(pds),5);
Graph0=SI; /* Spread Index */
Graph1=0; /* Provides a zero based line of blue color */
Graph1Style=5;

Buy=Cross(SI,0) ;
/* or PDI(14)>MDI(14) and ADX(14)>MDI(14) and (Hope and Cry)==0;*/
/* Having PDI and ADX and (Hope and Cry) does not test as well */
Sell=Cross(0,SI) OR ADX(14)<MDI(14) AND PDI(14)<MDI(14);

Buy=ExRem(Buy,Sell); /* this removes redundant buy/sell signals */
Sell=ExRem(Sell,Buy);

Short=Sell;
Cover=Buy;

/* The following code is the exploration code */

Filter=( /*ref(Buy,-1)==0 and*/ (Buy==1) );
NumColumns = 7;
Column0 =Ref(C+0.065,-1);
Column0Format = 1.2;
Column0Name = "Trigger Price";
Column1 = C;
Column1Name = "Close ";
Column1Format = 1.2;
Column2 = MA(V,17);
Column2Name = "17 Ma Vol ";
Column2Format = 1.0;
 
#3
The following AFL code has a mistake in Line 51. It says invalid argument for PDI() function. Argument range must be positive (and not null).
Can some one help?+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

//------------------------------------------------------------------------------
//
// Formula Name: DMI Spread Index
// Author/Uploader: Steve Wiser
// E-mail: [email protected]
// Date/Time Added: 2001-07-05 19:13:58
// Origin:
// Keywords:
// Level: basic
// Flags: system,exploration,indicator
// Formula URL: http://www.amibroker.com/library/formula.php?id=59
// Details URL: http://www.amibroker.com/library/detail.php?id=59
//
//------------------------------------------------------------------------------
//
// Uses DMI Spread Index as a system, indicator and exploration
//
//------------------------------------------------------------------------------

/* Settings setup should have buy and sell at open with one day delay. I also use a 5%
maximum stop loss. This code also plots the DMI Index in its own chart pane. Note that I
have also provided a zero line for better viewing of the zero cross.*/

/* Exploration, System and Indicator
Author Steve Wiser
Email address: [email protected]
May 5, 2001 */

Percent=3;
pds=PeakBars(C,Percent,2)-PeakBars(C,Percent,1);
pds=LastValue(pds);

/* the following code is for the consolidation periods or better know
as the sleeping Alligator */

var3= 5;
var4= 3;
var10=10;
var0= Ref(Wilders(C,13),-8);
var1= Ref(Wilders(C,8),-5);
var2= Ref(Wilders(C,5),-3);
var5= MA((var0+var1+var2),var4) ;
angle=atan(var5-Ref(var5,-var3)/var3);
angle=IIf( angle >90,angle-360,angle);
hope=IIf( angle <20 AND angle>-20,1,0);
cry=((StDev(C,var3*2) - Ref(Wilders(StDev(C,var3*2),8),-5))/
(Ref(Wilders(StDev(C,var3*2),8),-5)))<0;

/* End of Sleeping Alligator which is an area of little or no volitlity or price movement.*/

SI=MA(PDI(pds)-MDI(pds),5);
Graph0=SI; /* Spread Index */
Graph1=0; /* Provides a zero based line of blue color */
Graph1Style=5;

Buy=Cross(SI,0) ;
/* or PDI(14)>MDI(14) and ADX(14)>MDI(14) and (Hope and Cry)==0;*/
/* Having PDI and ADX and (Hope and Cry) does not test as well */
Sell=Cross(0,SI) OR ADX(14)<MDI(14) AND PDI(14)<MDI(14);

Buy=ExRem(Buy,Sell); /* this removes redundant buy/sell signals */
Sell=ExRem(Sell,Buy);

Short=Sell;
Cover=Buy;

/* The following code is the exploration code */

Filter=( /*ref(Buy,-1)==0 and*/ (Buy==1) );
NumColumns = 7;
Column0 =Ref(C+0.065,-1);
Column0Format = 1.2;
Column0Name = "Trigger Price";
Column1 = C;
Column1Name = "Close ";
Column1Format = 1.2;
Column2 = MA(V,17);
Column2Name = "17 Ma Vol ";
Column2Format = 1.0;
make minor changes:

pds=14;//PeakBars(C,Percent,2)-PeakBars(C,Percent,1);

... hope this helps
~manoj
 

mastermind007

Well-Known Member
#4
No, Manoj, acedubai

In this AFL, calculation of pds is dynamic and that is the crux of the AFL. If you change that definition, rest of the entire logic is rendered useless.

Correct line 51 by adding abs
SI=MA(PDI(abs(pds))-MDI(abs(pds)),5);

If that does not work, then add int(abs( .. ))
SI=MA(PDI(int(abs(pds)))-MDI(int(abs(pds))),5);

Next time, you want to talk about the code, highlight the line
where error comes using bold or color
 
Last edited:

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