Referencing existing historic data points

October 11th, 2022, 07:02 PM

I am a total newbie, so I'll apologize now if my question or premise is completely naīve. I've looked everywhere I can and I simply can't find an answer to this question.

Using a "ShowMe" study, I'm trying to plot points on past bars based on current conditions. Below is a snippet of code simplifying the concept.....

variables: IntrabarPersist iIndexSaved(0);

if someSpecificCondition() then iIndexSaved = CurrentBar;
if someAnotherCondition() then Plot1[CurrentBar - iIndexSaved](High[CurrentBar - iIndexSaved);

Even though I never actually reference a bar less than my current data stream, this code seems to run until "CurrentBar - iIndexSaved" is greater than "MaxBarsBack", then "MaxBarsBack" is changed to "CurrentBar - iIndexSaved" and the ShowMe is run over again from scratch. Since the re-run starts at bar number "MaxBarsBack", I don't have the data for the "someSpecificCondition" function to execute.

Here is actual code that should plot a line between the lowest low points between each high point.

Variables:
IntrabarPersist vHighIndex(0),
IntrabarPersist vLowIndex (0);

If High > High[CurrentBar - vHighIndex] Then Begin
vHighIndex = CurrentBar;
Plot2[CurrentBar - vLowIndex](CurrentBar - vLowIndex);
vLowIndex = CurrentBar;
End Else If Low < Low[CurrentBar - vLowIndex] Then Begin
vLowIndex = CurrentBar;
End;

Does this make sense?

Can anyone lend any insight?

ABCTG · October 12th, 2022, 04:29 AM

TheCocunut,

welcome to futures.io. This is expected behavior due to the way MaxBarsBack works within Tradestation.
In general, it is better to avoid looking back, if possible. For your case that could mean saving the High of the bar when your conditions are true.

If you must go back to that bar for that plot, you will have to accept this behavior. In that case using more historical data and allowing for large MaxBarsBack values
might be the way to go. Alternatively, you could use drawings for the display instead of a plot and not affect the max bars back value.

Regards,

ABCTG

TheCocunut

I am a total newbie, so I'll apologize now if my question or premise is completely naīve. I've looked everywhere I can and I simply can't find an answer to this question.

Using a "ShowMe" study, I'm trying to plot points on past bars based on current conditions. Below is a snippet of code simplifying the concept.....

variables: IntrabarPersist iIndexSaved(0);

if someSpecificCondition() then iIndexSaved = CurrentBar;
if someAnotherCondition() then Plot1[CurrentBar - iIndexSaved](High[CurrentBar - iIndexSaved);

Even though I never actually reference a bar less than my current data stream, this code seems to run until "CurrentBar - iIndexSaved" is greater than "MaxBarsBack", then "MaxBarsBack" is changed to "CurrentBar - iIndexSaved" and the ShowMe is run over again from scratch. Since the re-run starts at bar number "MaxBarsBack", I don't have the data for the "someSpecificCondition" function to execute.

Here is actual code that should plot a line between the lowest low points between each high point.

Variables:
IntrabarPersist vHighIndex(0),
IntrabarPersist vLowIndex (0);

If High > High[CurrentBar - vHighIndex] Then Begin
vHighIndex = CurrentBar;
Plot2[CurrentBar - vLowIndex](CurrentBar - vLowIndex);
vLowIndex = CurrentBar;
End Else If Low < Low[CurrentBar - vLowIndex] Then Begin
vLowIndex = CurrentBar;
End;

Does this make sense?

Can anyone lend any insight?

October 12th, 2022, 11:41 AM

Thank you for the comment. Its good to know that this is a system feature and not a user mistake. I will find another way to accomplish what I am trying to do (such as Drawings as you recommended). Thank you!

Referencing existing historic data points

Discussion in TradeStation

Referencing existing historic data points