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I think what you are after is a 2-dimensional array where each array contains a slope of a specific look-back period (i.e. 40,41,42,etc.) for each bar in your dataset. Unfortunately, AFL does not support multi-dimensional arrays (at least as far as I know...). Maybe using a function would be a way to reduce programming overhead:
function CalcSlope(Periods)
{
AvgSum = Sum(C,Periods)/Periods;
Slope = (AvgSum - Ref(AvgSum,-1)) / C * 100;
return Slope;
}
The function returns your slope as an array based on your specified look-back period. You'll probably still need to use a separate array variable for each slope:
Slope40 = CalcSlope(40);
Slope41 = CalcSlope(41);
// ...
Slope52 = CalcSlope(52);
Also, AB has a linear regression slope function which might be similar to your formulation and save your from needing your own function:
linregslope(ARRAY, periods)
Regards,
David
--- In amibroker@xxxxxxxxxxxxxxx, "Marty J" <prog200@xxx> wrote:
>
>
>
> --- In amibroker@xxxxxxxxxxxxxxx, Graham <kavemanperth@> wrote:
> >
> > You are only defining the values for bars between 5 and 50, not a full
> > array. ie slope[40] is the value for the 40th bar (per barindex()
> > count) of the history.
> > You need to explain what you are actually trying to achieve before any
> > help can be given
> >
> > --
> > Cheers
> > Graham Kav
> > AFL Writing Service
> > http://www.aflwriting.com
> >
> >
> >
> > 2009/12/24 Marty J <prog200@>:
> > >
> > >
> > > --- In amibroker@xxxxxxxxxxxxxxx, Aron <aron.groups@> wrote:
> > >>
> > >> |*for*(i=5;i<51;i++)
> > >> {
> > >> AvgSum = Sum(*C*,i)/i;
> > >> ry= Ref(AvgSum ,-1);
> > >> array = (AvgSum - ry)/*C* *100;
> > >> slope[i] = array[i];
> > >> }
> > >> |
> > >>
> > >>
> > >> On 12/23/2009 1:43 AM, Marty J wrote:
> > >> > I'm having trouble with the following code
> > >> > Like to fill the array.
> > >> >
> > >> > for(i=5;i<51;i++)
> > >> > {
> > >> > AvgSum = Sum(C,i)/i;
> > >> > ry= Ref(AvgSum ,-1);
> > >> > slope[i] = (AvgSum - ry)/C *100;
> > >> > }
> > >> >
> > >> > The following error occurs
> > >> > Error 8. Type mismatch, the value assigned to the array element has to be a number. You can not use array on the right-side of this assignment.
> > >> >
> > >> >
> > >> > Is there another way of doing this?
> > >> >
> > >> > Thnx
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> >
> > >> > ------------------------------------
> > >> >
> > >> > **** IMPORTANT PLEASE READ ****
> > >> > This group is for the discussion between users only.
> > >> > This is *NOT* technical support channel.
> > >> >
> > >> > TO GET TECHNICAL SUPPORT send an e-mail directly to
> > >> > SUPPORT {at} amibroker.com
> > >> >
> > >> > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
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> > >> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
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> > >> >
> > >> >
> > >> >
> > >>
> > > Still not working correctly.
> > >
> > > for(i=45;i<51;i++)
> > > {
> > > AvgSum = Sum(C,i)/i;
> > > ry= Ref(AvgSum ,-1);
> > > array = (AvgSum - ry)/C *100;
> > > slope[i] = array[i];
> > > printf("array = %f\n" ,array );
> > > printf("slope1[%g] = %f\n",i, slope[i] );
> > > }
> > >
> > > array = 0.543919 <==== this is what the value should be
> > > slope[45] = 0.073096 <==== This is wrong. Why?
> > > array = 0.562687
> > > slope[46] = 0.068811
> > > array = 0.441399
> > > slope[47] = 0.088211
> > > array = 0.372907
> > > slope1[48] = 0.094559
> > > array = 0.432736
> > > slope[49] = 0.096924
> > > array = 0.454843
> > > slope[50] = 0.094987
> > > array = 0.454843
> > >
> > >
> > > Thnx
> > >
> > >
> > >
> > > ------------------------------------
> > >
> > > **** IMPORTANT PLEASE READ ****
> > > This group is for the discussion between users only.
> > > This is *NOT* technical support channel.
> > >
> > > TO GET TECHNICAL SUPPORT send an e-mail directly to
> > > SUPPORT {at} amibroker.com
> > >
> > > TO SUBMIT SUGGESTIONS please use FEEDBACK CENTER at
> > > http://www.amibroker.com/feedback/
> > > (submissions sent via other channels won't be considered)
> > >
> > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG:
> > > http://www.amibroker.com/devlog/
> > >
> > > Yahoo! Groups Links
> > >
> > >
> > >
> > >
> >
> What I want to do is fill an array (40,41,42...50) instead of writing code for each one. This code calculate the slope.
>
>
> Avg40 = Sum(C,40)/40;
> ry = Ref(Avg40,-1);
> savg40 = (Avg40- ry)/ C *100;
>
> Avg41 = Sum(C,41)/41;
> ry = Ref(Avg41,-1);
> savg41 = (Avg41- ry)/ C *100;
> .
> .
> .
> Avg50 = Sum(C,50)/50;
> ry = Ref(Avg50,-1);
> savg50 = (Avg50 - ry)/ C *100;
>
> Like the above code to be shorten into a single for statement
>
> for(i=40;i<51;i++)
> {
> AvgSum = Sum(C,i)/i;
> ry= Ref(AvgSum ,-1);
> array = (AvgSum - ry)/C *100;
> slope[i ] = array[i];
>
> printf("slope1[%g] = %f\n",i, slope[i] );
> }
> where slope[40] = savg40
> where slope[41] = savg41
> .
> .
> where slope[50] = savg50
>
> Thnx
>
------------------------------------
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