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When detected automatically, '''MaxBarsBack '''will initially be set to the value of the largest data offset in the study; however, if a variable data offset is used in the script, the initial '''MaxBarsBack ''' value may prove to be too small. In such a case, the '''MaxBarsBack '''value will automatically be increased by 5 or by a factor of 1.618, whichever yields a higher value, and the study recalculated. The process of automatic '''MaxBarsBack '''detection may cause some functions to be executed repeatedly for the first few bars of a chart when a study is first applied; this can be avoided by setting the '''MaxBarsBack ''' value manually. To select the smallest '''MaxBarsBack '''value sufficient for a particular studystrategy, set the value manually. The recommended initial '''MaxBarsBack '''value is 50to the largest data offset across all signals applied to a given chart.
When a value of a bar '''N''' bars ago is referenced in a script, the study can only be visualized starting with the '''N + 1''' bar.
The number of previous bars that must be available for a script in order to start performing calculations is called '''Maximum number of bars a study will reference''', or '''MaxBarsBack'''. The '''MaxBarsBack''' value can for the signals should be selected to be detected automatically or set manually.
Learn more about setting '''MaxBarsBack''' values for [[Strategy_Properties|Signals]]
<br>
=== Order Execution Priority ===
|'''Position'''|| '''Flat''' ||'''Long'''||'''Short'''
|-
|'''Long Entry'''||''' 1 '''||''' 1 '''||''' 2 3 '''
|-
|'''Short Entry'''||''' 1 '''||''' 2 3 '''||''' 1 '''
|-
|'''Long Exit'''||''' - '''||''' 1 2 '''||''' - '''
|-
|'''Short Exit'''||''' - '''||''' - '''||''' 1 2 '''
|}
The net result of executing the above orders, from a Short position, will be a Flat position.
<br>
=== How Orders Are Sent Depending on the Last Bar Status ===
Three collections of orders are filled on each calculation: This Bar Close, Next Bar Market, Next Bar Price.<br>
If the last bar status of the base data series is closed (2 or -1) — This Bar Close orders are sent.<br>
If the last bar status of the base data series is opened (0 or 1) — Next Bar Market, Next Bar Price orders are sent.<br>
After the batch of orders is sent, it is cleared and will be filled only at the next calculation.<br>
<div style="background-color: #E5F6FF;">Tip: It is possible to view bar statuses (bar status from the chart, not from the script is meant) with the help of an indicator that updates on every tick..</div>
'''Examples'''<br>
''Situation 1''<br>
''2 and 2, where the number stands for the bar status from the script.''<br>
Only This Bar Close orders are sent if there are no new bars on the chart by this moment.<br>
If there is the new bar on the chart by this moment, Next Bar Market, Next Bar Price orders will be sent next.<br>
''Situation 2''</br>
''2 and 1''<br>
Only This Bar Close orders are sent if there are no new bars on the chart by this moment.<br>
If there is the new bar on the chart by this moment, Next Bar Market, Next Bar Price orders will be sent next.<br>
''1 and 2''<br>
Nothing is sent until the bar of the base data series is closed.<br>
''Situation 3''<br>
''1 and 2''<br>
Nothing is sent.<br>
''2 and 1''<br>
Only This Bar Close orders are sent if there are no new bars on the chart by this moment.<br>
If there is the new bar on the chart by this moment, Next Bar Market, Next Bar Price orders will be sent next.<br>
''Situation 4''<br>
''1 and 2''<br>
Nothing is sent.<br>
''2 and -1''<br>
Only This Bar Close orders are sent if there are no new bars on the chart by this moment.<br>
If there is the new bar on the chart by this moment, Next Bar Market, Next Bar Price orders will be sent next.<br>
[[Category:PowerLanguage]]
