How to initial variable when a new data come in

[Milosz]

@junjun

The system will execute which function, or the entire afl will be executed again

When and how often AFL code is executed:

When and how often AFL code is executed?

How to execute part of the formula only when new bar is added:

How to execute part of the formula only when new bar is added

@junjun

If I only use Data = 0 to initialize a variable, how do I distinguish?
Data = 0
Data1 = 0
Data => is an array
Data1 => is a simple variable

You should read about data types in AFL, variables, arrays, accessing array elements using - subscript operator etc:

When scalar becomes an array, aka. type coercion in AFL

Since the subject of data types surfaced in this thread: Send orders to IB on next bar (Intraday) Here are some comments regarding data types in AFL. While some users who familiarized a bit with array handling in AFL may think that everything is an array in AFL, that is not the case. The data type depends on value assigned to variable. If you assign scalar (number) the variable type will be scalar (floating point number, 4 bytes long). So if you assign a number to variable like this: var1 =…

https://www.amibroker.com/guide/a_language.html
https://www.amibroker.com/guide/keyword/typeof.html
https://www.amibroker.com/guide/h_understandafl.html

In general it is a little strange for me, that you wrote your own plugin lacking such crucial (and basic) knowledge - about how AFL works. No wonder, that it might not work as you expected.