where do the instances of indicators live constructed within the strategy class?

[alexL]

I am new to Ninja as well as C# and have a conceptual question regarding the way the code is organized. Please forgive me if my question is very naïve

If I use for example
Add(SMA(Fast));

I assume the code is calling a constructor of the SMA indicator class and creates an instance of this indicator within my strategy implementation. What confuses me is that I do not see the name of this instance.

As a result, when querying the indicator I do not refer to this instance but instead I need to do

CrossAbove(SMA(Fast), SMA(Slow), 1))

for example. Does the statement SMA(Fast) in the above line refers to the instance or does it recreate the object every time I need it.


many thanks

[koganam]

I am new to Ninja as well as C# and have a conceptual question regarding the way the code is organized. Please forgive me if my question is very naïve

If I use for example
Add(SMA(Fast));

I assume the code is calling a constructor of the SMA indicator class and creates an instance of this indicator within my strategy implementation. What confuses me is that I do not see the name of this instance.

As a result, when querying the indicator I do not refer to this instance but instead I need to do

CrossAbove(SMA(Fast), SMA(Slow), 1))

for example. Does the statement SMA(Fast) in the above line refers to the instance or does it recreate the object every time I need it.


many thanks

It creates its own instances. If you look at the "wrapper code" in the indicator, you will see that among other things it used for iterating through the domain to find the correct instances of itself.

Using a named instance is more efficient, so create your SMA's as named instances:

1. Declare them as class variables.
2. Assign them in the Initialize() method.

[NinjaTrader_CalH]

Hello AlexL,

Thank you for your post.

When you use Add(), it will create an instance of that indicator and cache it.

When you call that SMA(Fast) you are indeed calling that cached instance as to save memory.

Let me know if I can be of further assistance.