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DD:=8 {ANY VALUE RETURN FROM FORMULA};
ML:=(H+L)/2;
ExtFml("Forum.Sum",If(C>=ML,1,0),DD) {ML uses present value to be a
constant}
In this case, ML will be based on different periods' H and L ,
but I would like to count backward for summation by keeping present H 
and L as a constant for the rest of calculation.
Does anyone have any idea please?
Thank for any suggestion
Eric
For example
Present
H:=10
L:=8
ML:=9
1 DAY BACKWARD
H:=8
L:=6
ML:=9 {value from present}
2 DAY BACKWARD
H:=7
L:=5
ML:=9 {value from present}
...
8 DAY BACKWARD
H:=8
L:=4
ML:=9 {value from present}
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