Hi, I would like to be able to do the equivalent of a while statement. I would like to hold the flow until the shift 0 volume bar on its close exceeds a defined value but I'm not sure how's the best way to do this. It seems it could be something that Loop viewer might be used for. But I'm not sure, and I also don't know if the loop viewer can handle volume bars. Your advice would be very appreciated. Thanks

Hi,

I understand from your description that you'll work on Candle start based on a given period. The on candle start is updated (or executed) every candle close / Start of new candle. So the value of your volume will be retrieved at this moment exactly. So a simple IF condition to check the volume level is enough to do your requirement.

Check the attached example, I've included some comments in it.

Cheers

Thanks for that explanation. Just for my clarification, I note in your attached example that the shift 0 value comes from the Gethistorical Candle block. Shift 0 though is the "live" current bar (as opposed to a historical bar). So I guess there's some nuance that enables a shift 0 value can be obtained from the historical data. I see that calling for shift 0 close is like calling shift 1 open for price (and shift 1 is historical of course). But for volume, shift 0 close has a volume that is greater than zero, whereas for shift 1 open the volume is zero. I guess I'm missing something to make it all sensible.

Hi,

Shift 0 is as you said referring to the current live candle. Shift one is historical.
There is no concept of shift open and shift close at all. For this example, the volume is retrieved from the predefined candle (using shift) and refreshed according to the start pooint and applied filters.
I advice you to play with that on real-time run using a demo account and drag and drop the value of the volume on the work-space to see its real time value (debugging)
I'm sure you'll get the way this works.

if you use shift 0 with the period filter and test on real time: you'll have volume approx. null why ? Because the check (update) is made at close price of the current candle (just at the time expiry of the candle period) and the start of the new candle (open price) which becomes the new current one and this is the reason why the volume retrieved is almost 0 or slightly more (if so then we can conclude that this little volume corresponds to the traded volume at the open price of the new candle)

Hope this is clear

Enjoy your WE !

Thank you. I'd like to be sure about something though. I get the impression that a WHILE loop can be achieved with an IF block with only one output. Is that right? Or is there another way for creating a WHILE loop? thanks.

Hi,

With an IF condition associated to a loop Viewer you'll be able to achieve a "do..while" the IF should be one way exit indeed unless you have another condition.

cheers

I see - so does this mean that a Loop Viewer block can be broken out of early (i.e. before the LV finishes processing the full array) once the IF condition is achieved?

Yes if the condition is implemented inside the loop.
but if it is build build this way for instance, you don't need to worry about your performed loops