How to get the Buys and Sells Series from BuySellVolume()?

[kelefei]

Hi,

I would like to calculate the SMA of Buys from BuySellVolume, I tried the following but and it gave me error, seems BuySellVolume().Buys is not a series.



Value[0] = SMA(BuySellVolume().Buys, 12)



So how can I acheive this? thanks.

[NinjaTrader_ChelseaB]

Hello kelefei,

Below is a link to the help guide with sample code.

https://ninjatrader.com/support/helpGuides/nt8/buysellvolume.htm

Be sure to look up any system indicator in the help guide for its method overload signatures and a code sample of the usage.

Buys is a series. That part of the code you have appears fine to me.

SMA() returns a series and Value[0] is a double.. Were you intending to return the most recent value of the SMA to the to plot series?
If so, you need a barsAgo index.
Value[0] = SMA(BuySellVolume().Buys, 12)[0];

Are you sure you added a plot with AddPlot() for Value collection to exist?

https://ninjatrader.com/support/helpGuides/nt8/addplot.htm

https://ninjatrader.com/support/helpGuides/nt8/value.htm

[kelefei]

Hi,

This syntax is correct now:
Value[0] = SMA(BuySellVolume().Buys, 12)[0];

However, it only show me the value for most recent bar and no any historial data (all zero).

I have already checked tick replay box and buysellvolume indicators works fine.

So am I missed something in the script?

Thanks.

[NinjaTrader_ChelseaB]

Hello kelefei,

May I confirm you have followed the direction in the help guide on Developing for Tick Replay in the 'Calling a Tick Replay indicator from another Indicator or Strategy' section?

https://ninjatrader.com/support/helpGuides/nt8/developing_for__tick_replay.htm

From the help guide:
"you either need to store the reference in State.DataLoaded"

TickReplayIndicator myTickReplayIndicator = null;

else if (State == State.DataLoaded)
{​
// Store a reference to the Tick Replay indicator before State.Historical
// Doing so ensures the hosted indicator will run through Tick Replay
myTickReplayIndicator = TickReplayIndicator();​
}

protected override void OnBarUpdate()
{
// Access the stored reference which calculates through
// historical Tick Replay data and print the value as expected
Print(myTickReplayIndicator[0]);
}

Using this for the BuySellVolume:

In the scope of the class

private BuySellVolume myBSV;

In State.DataLoaded:

myBSV = BuySellVolume();

In OnBarUpdate:

Print(string.Format("{0} | myBSV.Buys[0]: {1}", Time[0], myBSV.Buys[0]));