Gettting indicator as dataseries?

[AntiMatter]

This is basic, but I can't get it right. I declare a dataseries i.e.:

DataSeries ds_normalized_spread;

And then in OnStartUp(), I want to set it to the plotted value of the following indicator:

ds_normalized_spread= Ratio(false, symbol2, includeMultiplier). ?????? ;

What am I missing?

[NinjaTrader_CalH]

AntiMatter,

Thank you for your post.

In your example you are trying to set the DataSeries as a Ratio value

You would want to Set() the data series with values.

ds_normalized_spread.Set();

[AntiMatter]

"Ratio" is the name of an indicator here:

http://www.ninjatrader.com/support/forum/local_links.php?catid=4&sort=N&pp=15&page=9

I want the DataSeries to be set to the output of the indicator....

[NinjaTrader_CalH]

This is how you would want your setup to be-

ds_normalized_spread.Set(Ratio(false, symbol2, includeMultiplier)[0]);

[AntiMatter]

**NT** Error on calling 'OnStartUp' method for strategy 'NormalizedSpreadStrategyJC1/0f43af4480324a40bf4c653b2f386a73': Object reference not set to an instance of an object.

[NinjaTrader_CalH]

AntiMatter,

Apologies, I did not see that you were trying this in OnStartUp()

You will need to use this in OnBarUpdate() so that the values get added to the data series for each bar update.

[AntiMatter]

Thanks for all the help. I am trying to adapt some existing code, which assigns the following indicator to the DataSeries in OnStartup():

ds_normalized_spread=PSTNormalizedSpread(averageBa rs, dblMPFixedValue, includeMultiplier, inputSeriesSelection, nAgo, nsAverageType, nsMidpointTypeSelection, nsPITType, showMidpoint, showNormalizedSpread, showRawSpreadPriceSeries, spreadType, symbol1, symbol1Units, symbol2, symbol2Units, symbol3,symbol3Units).NormalizedSpread;

However, rather than utilising the PSTNormalizedSpread, I want to instead utilise the Spread indicator. e.g.:

ds_normalized_spread= Ratio(false, symbol2, includeMultiplier).value ????

I have played around with your suggestions above, but it is not behaving as expected. This is probably due to it being a multi-instrument strategy, so when utilising:

ds_normalized_spread.Set(Ratio(false, symbol2, includeMultiplier)[0]);

it gets set to the wrong value when the BarsInProgress = symbol2.

Thus, I would like to assign the indicator to the dataseries in the same way as the original author did. I just can't seem to do it!

[NinjaTrader_CalH]

Antimatter,

You can use the BarsInProgress to separate out the data so that when BIP == symbol1 and then Set() the value, it will only apply to the values from symbol1

if(BarsInProgess == 1)
{
//set your dataseries value here
}

[AntiMatter]

OK thanks, was going down that route anyhow, but thought it might be cleaner to keep it the same way as the original script. Also, I wasn't really understanding why the original author could assign his indicator that way, but I cannot assign my indicator in the same way???!

[NinjaTrader_CalH]

Do you have an example of how they were writing it?

[AntiMatter]

Do you have an example of how they were writing it?

#region Variables
            DataSeries ds_normalized_spread;
            Bollinger bb_entry;

And in OnStartUp:

        protected override void OnStartUp()
        {
           ds_normalized_spread=PSTNormalizedSpread(averageBars, dblMPFixedValue, includeMultiplier, inputSeriesSelection, nAgo, nsAverageType, nsMidpointTypeSelection, nsPITType, showMidpoint, showNormalizedSpread, showRawSpreadPriceSeries, spreadType, symbol1, symbol1Units, symbol2, symbol2Units, symbol3,symbol3Units).NormalizedSpread;

bb_entry=Bollinger(ds_normalized_spread,entryBandStdDev,spreadBandCalcHorizon);

And then later, it is used ie.

if (ds_normalized_spread[0]>bb_entry.Upper[0])
                        {

I would like to simply replace the

ds_normalized_spread=PSTNormalizedSpread(.....) for a different indicator. For example, using the output from the Ratio indicator.

As you can see, I am a little out-of-my-depth here, so thanks for the help.

[NinjaTrader_CalH]

AntiMatter,

Your example is calling the Indicator itself and not a data series from the Ratio.

You can access and public dataseries from the Ratio by adding a period at the end and selecting the name of the dataseries

Example -
ds_normalized_spread = SMA(14).Value;