Hello,
Thank you very much for your e-mail.
First and foremost:
please read http://www.amibroker.com/guide/h_understandafl.html
Reading this is essential to understand array processing.
You have got self-reference (recursion) in your code and you are not getting
the result you want because you forgot/did not know that Ref() as any other
array function processes entire array AT ONCE.
If you formula has to "keep" some old value, the proper array-wise way to do this
is to use ValueWhen function
PreviousValuePlaceholder = 0; // any value other than values assigned below
MySignal = IIF( Condition, 1, IIF( Condition2, -1, PreviousValuePlaceholder ) );
MySignal = ValueWhen( MySignal != PreviousValuePlaceholder, MySignal );
Of course it can be be shortened to single line:
MySignal = ValueWhen( Condition1 OR Condition2, IIF( Condition1, 1, -1 ) );
but I wanted to show general idea. Compact codes are nice but usually skip some "mental indirection" levels.
Best regards,
Tomasz Janeczko
amibroker.com
Hello,
Let's imagine i have two very different ema crossovers and i want to make sure that i don't get conflicting values so i first check the buy and if not then i check sell, if not either then i want previous value of signal.
Why is not getting the array the previous value?
MySignal[499]=0;
Condition1=EMA(C,10) > EMA(C,20);
Condition2=EMA(C,20) < EMA(C,40);
MySignal=IIf(Condition1, 1, IIf(Condition2, -1, Ref(MySignal,-1)));
Buy = MySignal==1;
Sell= MySignal==-1;
Thanks and Best regards,
Posted by: Tomasz Janeczko <groups@amibroker.com>
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