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each array is aligned with the data that it is based on. MA(C,5) is
aligned to the close array, no offset applied
This would align the ma with the Close3
Close3 = ref( C, -3 );
Centreline3 = ma( Close3, 5 );
Buy = Close3 >Centreline3;
If you want the signal to be C>MA and just have entry 3 bars later,
then B is correct
Of course you could always use something like this
settradedelays(3,1,3,1);
Buy = c>ma(c,5);
or if you only want to scan on bar before the entry then simplified
settradedelays(1,1,1,1);
Buy = ref( c>ma(c,5), -3 );
--
Cheers
Graham Kav
AFL Writing Service
http://www.aflwriting.com
2009/4/15 ozzyapeman <zoopfree@xxxxxxxxxxx>:
>
>
> I know this is AFL 101 but I'm a bit confused on it.
>
> Let's say I wanted to Buy today if the Close of three days ago was higher
> than its "center line" moving average. I know I have to shift the Close
> array, but do I also have to shift the MA array to make this comparison? My
> thought is yes.
>
> So of the two formulas below, Formula B should be the correct one. Or is it?
> Does AFL automatically shift built-in function arrays when making
> comparisons? In that case, Formula A would be correct.
>
>
> Formula A
>
> CenterLine = MA(C, 5);
>
> Close3 = Ref(Close, -3);
>
> Buy = Close3 > CenterLine
>
>
> Formula B
>
> CenterLine = MA(C, 5);
>
> CenterLine3 = Ref(CenterLine, -3);
>
> Close3 = Ref(Close, -3);
>
> Buy = Close3 > CenterLine3
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