C-Script syntax types

Question

I am starting to program in C script block and I have questions:

When defining a variable in 'code declarations,' why are there two syntax types? For example, this: '#define PREV_INPUT DiscState(0)' and the other syntax '#define DELAY ParamRealData(0, 0)'. My question is: How do we interpret or understand the arguments in 'DiscState(0)' and 'ParamRealData(0, 0)'? I understand that the following syntax 'DiscState(i)' and 'ParamRealData(i, j)' refers to the ith and jth values, respectively. Another question is: In what cases is it better to use the first notation or the second notation?

Thank you.

Answer 1

The syntax between your two examples is the same in that it uses the #define preprocessor directive.  It seems you are confused by the last argument in the #define directive. In the examples you referenced, the last argument refers to pre-defined C-Macros in PLECS. The different macros allow you to access block data such as input/output signals, parameters, and states.

Refer to the C-Scripts + C-Script Macros section of the PLECS Manual for a description of the available macros.  The graphic pasted below shows a subset of the available macros.