Using indicator within indicator

[yaniv]

I am trying to develop an indicator that uses the data from another indicator, for example SMA
but I want the SMA to be calculate using new data that I am creating during running,
for that, inside OnBarUpdate Im trying to insert the line:
SeriesA[0] = SMA((SeriesB+ SeriesC) * 3, 6)[0]
with no success, how can I make operations on data series I have created and how can I use it as input for the SMA function ?

Thanks

[bltdavid]

Using you're example,
you would need to create a fully self-contained SeriesD,

SeriesD[0] = (SeriesB[0] + SeriesC[0]) * 3;

SeriesA[0] = SMA(SeriesD, 6)[0];

Make sense?

[bltdavid]

EDIT:
This is the comment by OP before post was deleted:
"Yes, Thanks And how can I get the bollinger upper and lower bands
values if I would like to use it within my indicator ? Thanks"

I've resurrected his question here, since it helps to explain my post.
(Besides, it's a fairly good question, and equally good response. )

-=o=-

Since you're into NinjaScript, let's go over how to find the answer.

How do you 'think' you're supposed to do it?
(I'm not being mean, stay with me)

That is, your 'thinking' is already there -- almost.

Instead of just giving you the fish, I'll try to teach you how to fish.

Ready?

-=o=-

Whenever you have a question (like the above) about accessing the
public data pieces of a specific indicator, go to the source code of
that indicator, in this case @Bollinger.cs -- and first thing to do is
scroll down to find the 'Properties' section.

See 1st attached screenshot.

Look for the names of the public properties, these are the names that
you can use when accessing that indicator.

That's tip number 1.

-=o=-

But how do you call that indicator?

Your thinking with using SMA was spot-on, but here's how you know
for sure -- Bollinger is a little harder, because calling it takes 2 arguments.

How do I know that?

Scroll past the Properties in @Bollinger.cs -- you're looking for the
'NinjaScript generated code' section.

Don't scroll too far.
The first method you see is how you call that indicator.

See 2nd attached screenshot.

That's tip number 2.

-=o=-

Let's put both tips together.

So, now you know, to call Bollinger, you'll provide two arguments, the
StdDev and Period, something like this,

Bollinger(2, 14)

and to get the upper and lower values, you found these were available
as public properties, and since they are data series, you access those
next, like this,

Bollinger(2, 14).Upper
Bollinger(2, 14).Lower

Now the above returns the whole Series<double>, but you don't usually
want the whole enchilada, you just want a piece, the last piece.

So, to get the value of the most recently closed bar, you use a BarsAgo
index of '0' at the end, just like you did with SMA, like this,

Bollinger(2, 14).Upper[0]
Bollinger(2, 14).Lower[0]

That's it!

Make sense?

[NinjaTrader_BrandonH]

Hello yaniv,

THanks for your note.

bltdavid is correct.

You could create a Series<double> variable, such as SeriesD, and assign (SeriesB[0] + SeriesC[0]) * 3 to that SeriesD variable. Then, you could use that SeriesD variable when calling SMA(ISeries<double> input, int period)[int barsAgo].

For example, SeriesA[0] = SMA(SeriesD, 6)[0];.

See the help guide documentation below for more information.

Series<T>: https://ninjatrader.com/support/help...t8/seriest.htm
SMA(): https://ninjatrader.com/support/help...simple_sma.htm

Please let me know if I may assist further.