Calculating Prev. Values

Im am working on a custom indicator atm. I wondered how to calculate a value on 1 bar to a previous bar.
eg. I get a value from a calculation on each bar. so lets say i limit this to just 10 bars. the 10th bar is 10, 9th bar value is 9, 8th is 8 etc... I want to take this value and add it to the next bar value. so ie 10th bar plus 9th bars value, plus the 8th bars value, plus the 6th bars value and so on.... So for this example I would get 10 plus 9 plus 8 plus 7 plus 6 etc.
On the chart Id like it to show the cummulative value on the next bar. So lets say im on the 6th bar, the value for this calulation should = (10 + 9 + 8 + 7) = 34. When the 5th bar shows up it adds the 6 bars value to this cummulative value so = (34 + 6) the 4 previous bars plus the new bar.
Hope this is clear? i dont know how else to put it really.

Heres a basic of the code I have

dResult_1 = High[1];

dResult_2 = High[2];

dResult = dResult_1 - dResult_2;

I now want to add dResult to the last bars dResult, to give:

Cum_Result = ........

lets say in this case dResult = 23 for the 3rd bar
The 2nd bar dResult = 3
so i want to add the 3rd bar value to the 2nd ( 23 + 3 ) to give 26. Then on the next new 2nd bar, add this to the last value of 26. lets say the new 2nd bar comes in at 9, so add 26 to 9.

No matter what I do I cant seem to get the correct result. Any help or suggestion welcome.

Hi fry,

It will be best to simplify the calculation.

Cum_Result = High[1]-High[2] + High[2]-High[3] + High[3]-High[4] ....
Cum_Result = High[1] - High[n]; // for n bars, after simplification.

I hope I am not mistaking something.

Regards,
chandra

Cool. thank you for that. took a little time to get my head round how it wud work.
I have also just used this and I think this too is giving correct results:

for(int i=1;i<limit;i++)

then I just take value i soo..

what i put up before for the high, then do the same again but this time:

NResult_1 = High[i];

NResult_2 = High[i+20];

NResult = NResult_1 - NResult_2;

Cum_Result = dResult + NResult;

I think that your method tho is much simpler, a lot less code...
One question, with this:
Cum_Result = High[1]-High[2] + High[2]-High[3] + High[3]-High[4] ....
would I need to continue with it to get more bars or will it calculate those when I use the High[n]?

You can see that there are -High[2]+High[2] which will become zero. Same way, all in-between values will become zero. Thats why you need only High[1] and High[n]. Both will give same values, but High[1]-High[n] is very simple.

chandra

Hi chandra. Long time since I posted here, and thanks again for that code, it did make it more simple.
Only problem is I fort that it was giving correct values, but it turns out it is not calculating it to how I want it to. I have no idea why this is.
Here is an example of where the value is incorrect and gives an odd result.

Just for most recent two bars:

Last bar went down -8 pips. The next bar goes up +7 pips.
Yet on the indicator it shows:
-8 pips for the second bar. Then for some reason instead of adding +7 to -8, it gives a value of +13?
I need the indicator to show this +13 value as -1, because if you do : -8 + 7 it should equall -1, not +13.
Any ideas?

Hi fry,

It does not matter what happend in the last bar, unless you are using only two bars for the calculations. When you are using 20 bars, the only thing that matters is what happened in the recent bar and 20th bar. Only that will come as the change in value. So, if 20th bar had a -6 and recent bar had a +7, then the value will change by +13 compared to last bar. Just trust the calculations.

chandra

Thanks again Chandra. That makes a lot of sense although I would have preffered it to litterely add to the last bars value, not the difference since n bars.