[PL] Signal plots several times per bar with different value

Dear All,

I am having issues writing a signal in powerlanguage.

I want the signal to plot the difference between the white xaverage and the low of a bar. It does it, but gives me several values for a bar, see the attached screenshot. How come? Is there a way to fix this>

Here is the signal:
Many thanks,

You could use if barstatus (1) =2 to plot the arrow only at the end of the bar
or you need to delete the arrow and the text erverytime the diff value changed intrabar using arw_delete.

Dear SP,

Thank you for your reply.

I write the following, but Barstatus() does not seem to work:


I don't really know how to delete the arrow intrabar

You have essentially two choices.

First, you could put the text_new inside of an "if barstatus(1) = 2 then" such that the text is only added if the bar is complete.

or

Second, you could save the text object's identifier created by text_new in an intrabarpersist variable (not just discard it in value1) and then later, in subsequent ticks on the same bar, either delete the object first and re-add it, or better, change the text on the same existing object by referencing its identifier which you earlier saved.

A key issue here is that relative to what you're doing now, value1 isn't intrabarpersist, and therefore, you're not saving the identifier, and also, the barstatus qualification should likely be on the creation of a new arrow rather than just on the assignment of the text.

Dear Bruce,

Thank you very much for your reply and explanations.

I have tried your first suggestion as the second one is a bit more complex for me.
But it does not fixed the problem (although logically it should), I still get up to 3 texts per bar...

Any other ideas?

Running the exact code you've posted, there is only one text object per bar as expected.

Perhaps you are not running that code verbatim, or perhaps you have some issue specific to a particular kind of bars (for instance, you could be using bars so small that there are multiple bars for the same date and time - in which case the text objects would overlap because they're specified by the date and time), but there is not an issue in general.

Dear Bruce,

Thanks for trying, I will submit this to the support.

Many thanks,

The following code will work:
If you take a look at the help you will see why there are multiple arrows on the single bar:

Usage
Arw_New (BarDate, BarTime, PriceValue, Direction)

Parameters
BarDate - a numerical expression specifying the date of the bar at which the object is to be placed; the date is indicated in the YYYMMdd format, where YYY is the number of years since 1900, MM is the month, and dd is the day of the month

BarTime - a numerical expression specifying the time of the bar at which the object is to be placed; the time is indicated in the 24-hour HHmm format, where 1300 = 1:00 PM

PriceValue - a numerical expression specifying the price value (vertical position, corresponding to a value on the price scale of a chart), where the object is to be placed

Direction - a logical expression specifying the direction of the arrow; True = Down and False = Up
-----------------
Time coordinates will be accurate within minutes.
According to the picture the neighboring bars have the same time.

There is another function that specifies time with second precision:


Arw_New_s (BarDate, BarTime_s, PriceValue, Direction)

BarTime_s - a numerical expression specifying the time of the bar, including seconds, at which the object is to be placed; the time is indicated in the 24-hour HHmmss format, where 130000 = 1:00:00 PM


Please try this way:
value1 = arw_new_s(date, time_s, low, false);

Dear Andrew,

Well spotted! The arw_new_s & time_s solutions fixed it!

Thank you again for your support,