looking for an ema based on min bars to run on volume chart

[stafe]

not even sure how i would search for such a thing - haven't had any luck...
but i'm looking for or would like to know how to write or setup an EMA that is based on a 2min calculation overlaid on my current volume based bar charts...
thanks,
wes

i do have rudimentary C# skills

[NinjaTrader_ChelseaB]

Hello stafe,

All links below are publicly available.

Below is a link to a video that demonstrates using a secondary series for the input series of an indicator.

https://youtu.be/XRGxiO3XW-k

Also, below is a link to the help guide on AddDataSeries().

https://ninjatrader.com/support/helpGuides/nt8/en-us/adddataseries.htm

And a link to the SMA in the help guide.

https://ninjatrader.com/support/helpGuides/nt8/en-us/moving_average_-_simple_sma.htm

As well as a link to an example script that demonstrates using a secondary series.

https://ninjatrader.com/support/forum/showthread.php?t=6652

[stafe]

thanks for the reply Chelsea... i tried adding a 2min data series to my volume chart like the video tutorial and it made all my hull moving averages ripply like ruffles potato chips.... odd... gonna have to figure something else out.... more reading to do.... /w

[NinjaTrader_ChelseaB]

Hello stafe,

When using multiple series, this will disable the equidistant bar spacing and attempt to show each bar for both series at the correct time.

Adding a data series to a custom indicator and using this as the input series for a call to the SMA would not cause this behavior.

[stafe]

oh, i'm a little stuck...
i'm trying to get this indicator to plot a 2min hull with bollinger bands on a volume based chart...


do i call the second data series (2min) in OnBarUpdate by using the following 2 lines in place of the first two lines in OnBarUpdate?
double hma0 = hma(Inputs[1][0];
double stdDev0 = stdDev(Inputs[1][0];



it just seems like i should be calling the 2nd data series (2min) earlier - like before State = = State.DataLoaded



thanks/sf




namespace NinjaTrader.NinjaScript.Indicators
{
public class BollingerHMA2minute : Indicator
{
private HMA hma;
private StdDev stdDev;

private int plot0Width = 2;
private PlotStyle plot0Style = PlotStyle.Line;
private DashStyleHelper dash0Style = DashStyleHelper.Solid;
private int plot1Width = 4;
private PlotStyle plot1Style = PlotStyle.Line;
private DashStyleHelper dash1Style = DashStyleHelper.DashDot;


protected override void OnStateChange()
{
if (State == State.SetDefaults)
{
Description = @"";
Name = "BollingerHMA2minute";
IsOverlay = true;
IsSuspendedWhileInactive = true;
ArePlotsConfigurable = false;
IsAutoScale = false;
Calculate = Calculate.OnPriceChange;

BarsRequiredToPlot = (Period * 2);
NumStdDev = 1.0;
Period = 100;
ChannelOpacity = 0;

AddPlot(Brushes.Gray, "upper");
AddPlot(Brushes.Gray, "middle");
AddPlot(Brushes.Gray, "lower");

UpBrush = Brushes.Green;
DownBrush = Brushes.Red;
NeutralBrush = Brushes.Yellow;
}

else if (State == State.Configure)
{

------------------ AddDataSeries (BarsPeriodType.Minute, 2);

Plots[0].PlotStyle = plot0Style;
Plots[0].DashStyleHelper = dash0Style;
Plots[0].Width = plot0Width;
Plots[1].PlotStyle = plot1Style;
Plots[1].DashStyleHelper = dash1Style;
Plots[1].Width = plot1Width;
Plots[2].PlotStyle = plot0Style;
Plots[2].DashStyleHelper = dash0Style;
Plots[2].Width = plot0Width;

}
else if (State == State.DataLoaded)
{
hma = HMA(Period);
stdDev = StdDev(Period);
}
}

protected override void OnBarUpdate()
{



---------------- double hma0 = hma[0];
---------------- double stdDev0 = stdDev[0];

Upper[0] = hma0 + NumStdDev * stdDev0;
Middle[0] = hma0;
Lower[0] = hma0 - NumStdDev * stdDev0;


}

[stafe]

i tried everything... Inputs[1] and BarsArray [1] in every permutation i could think of based on all the examples and question i read through on the forum


several "versions" i could get to compile but they wouldn't plot and the message in the log kept repeating : You are accessing an index with a value that is invalid since it is out of range....


i decided to start over and add each argument that i could and compile and see what happens and as soon as i add the 2min data series in State.Configure:
AddDataSeries(BarsPeriodType.Minute, 2):
i get the out of range error after compiling and trying to plot...


my final guess after reading everything i could find was to make the switch to the 2nd data series (2minute) under State.DataLoaded by changing the inputs on the HMA and StdDev to this:


hma = HMA(BarsArray[1], Period);
stDev = StdDev(BarsArray[1], Period);


shouldn't that be all i need to have made the entire indicator plot only the 2min 2nd data series ?


but nothing plots because there's some out of range thing gonig on that i can't comprehend that seems to be introduced just by adding the 2nd Bars series...

[NinjaTrader_ChelseaB]

Hello stafe,

You will need to ensure that each series has a bar.

Below is a public link to a reference sample that demonstrates using a added series for the input of an indicator call.

https://ninjatrader.com/support/helpGuides/nt8/en-us/using_a_secondary_series_as_an.htm