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Variable assignment changes output?
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Created: by TahuPhoenix Attachments:0

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Variable assignment changes output?

  #1 (permalink)
Trading Apprentice
Lund Sweden
 
Futures Experience: Intermediate
Platform: MultiCharts
Favorite Futures: Stocks
 
Posts: 4 since Feb 2015
Thanks: 1 given, 0 received

Variable assignment changes output?

Dear Forums,

I recently wrote a bit of code which purpose is to calculate Intraday-Turnover no matter what resolution you're looking at. The results:

 
Code
Vars:
	Intrabarpersist Turnover(0),
	countDays(0);


Turnover = Turnover + (Close * Ticks);
countDays = countDays + 1;
if(Date <> Date[countDays]) then
begin
	Turnover = Close * Ticks;
	countDays = 0;
end;

Plot1(Turnover, "Turnover");
The code calculates the intraday value of all contracts which was sold and resets until the next day, and it seems to work fine.

Out of curiosity and learning, I wanted to make an array which stored the Close of the last bar of each day, no matter the resolution. I figured that since I've got some code that already figures out when the next day comes, this shouldn't be a problem.

New Code:

 
Code
Vars:
	Intrabarpersist Turnover(0),
        count(0),
	countDays(0);

Arrays:
	daysArray[] (0);



Turnover = Turnover + (Close * Ticks);
countDays = countDays + 1;
if(Date <> Date[countDays]) then
begin
	Turnover = Close * Ticks;
	countDays = 0;
	daysArray[count] = Close[currentbar];
        count = count + 1;
end;
	
Plot1(Turnover, "Turnover");

And now the results are completely different. As soon as I try to assign any variable to "Close[currentbar]", the rest of my code stop working properly. How come this is? It's driving me nuts. I know I can use different data series, but for this experiment I'm trying to fit it into the same.


All the best,
TahuPhoenix

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  #2 (permalink)
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  #3 (permalink)
Market Wizard
Hamburg Germany
 
Futures Experience: Advanced
Platform: Multicharts, Tradestation, Multicharts.NET, NinjaTrader, MetaTrader
Broker/Data: DTN IQ
Favorite Futures: ES
 
Posts: 1,533 since Apr 2013
Thanks: 231 given, 854 received
Forum Reputation: Legendary


TahuPhoenix,

when you index a reserved word or variable to get the value from X bars back the values start from the current bar and go up. Currentbar = 0, 1 = the bar on the left from the currentbar etc.

With Close[CurrentBar] you are likely trying to look at a bar that is not even accessible. Assume you are at CurrentBar = 100, with Close[100] you try to access the 100th bar left from the current bar. Which means you'd need 101 bars on the chart, but only have 100 at current bar 100.
Long story short you have to use Close[0] to get the current close at the moment of the code calculation.

Regards,
ABCTG

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