Bar index for series differs from bar index for non-series

[tinker70]

Sorry for all the newbie questions. I'm looking at the BarIndexes.efs script, and I see where the script labels the bars using the getCurrentBarIndex() value. However, in other scripts I see the call to a series object (such as on created from stochK and stochD) using 0, with the comment that that's the current value (e.g., myStochD.getValue(0)), even when processing historical data (i.e., non-streaming). And, in running such a script, that seems to be fine.

The documentation says that getValue() takes an argument that is the bar index. So the concept of the 'current' bar index as returned from getCurrentBarIndex() seems to be different from that expected by a series object's getValue() method.

Is it that a series object, while processing historical bars, is 'current' with the bar being processed, so a value of 0 is to be used?

Here's a script that uses getValue(0) to return the plotted value in all cases, historical bars and streaming.

function preMain() {
   setPriceStudy(false);
   setCursorLabelName('gts.%K', 0);
   setStudyMin(0);
   setStudyMax(100);
   setDefaultBarFgColor(Color.blue, 0);
}
//global Series Object variables
var QldKSeries = null;
function main() {
     if (QldKSeries == null) QldKSeries = stochK(14, 1, 3);
     return QldKSeries.getValue(0);  // Current Bar Index value
} 

Why wouldn't the argument to getValue() not have been the return from getCurrentBarIndex()?
Thanks.

[ACM]

Re: Bar index for series differs from bar index for non-series

tinker70

So the concept of the 'current' bar index as returned from getCurrentBarIndex() seems to be different from that expected by a series object's getValue() method.

That is correct.
The getCurrentBarIndex() function returns the absolute index of a bar within the chart whereas the bar index used in the getValue() method of the series object is relative to the bar being processed by the efs engine

Is it that a series object, while processing historical bars, is 'current' with the bar being processed, so a value of 0 is to be used?

That is correct
Alex

Originally posted by tinker70
Sorry for all the newbie questions. I'm looking at the BarIndexes.efs script, and I see where the script labels the bars using the getCurrentBarIndex() value. However, in other scripts I see the call to a series object (such as on created from stochK and stochD) using 0, with the comment that that's the current value (e.g., myStochD.getValue(0)), even when processing historical data (i.e., non-streaming). And, in running such a script, that seems to be fine.

The documentation says that getValue() takes an argument that is the bar index. So the concept of the 'current' bar index as returned from getCurrentBarIndex() seems to be different from that expected by a series object's getValue() method.

Is it that a series object, while processing historical bars, is 'current' with the bar being processed, so a value of 0 is to be used?

Here's a script that uses getValue(0) to return the plotted value in all cases, historical bars and streaming.

function preMain() {
   setPriceStudy(false);
   setCursorLabelName('gts.%K', 0);
   setStudyMin(0);
   setStudyMax(100);
   setDefaultBarFgColor(Color.blue, 0);
}
//global Series Object variables
var QldKSeries = null;
function main() {
     if (QldKSeries == null) QldKSeries = stochK(14, 1, 3);
     return QldKSeries.getValue(0);  // Current Bar Index value
} 

Why wouldn't the argument to getValue() not have been the return from getCurrentBarIndex()?
Thanks.