Current sum of a variable in S-Function Builder

Hello!

I want to calculate the current value of a variable which increases and decreases depending on some conditions. I am using the S-Function Builder, but I want to initialise this variable only at the beginning of the simulation (only once and NOT every time the C-Script runs). How can I do that?

Thank you in advance!

Answer 1

[Diya Tulshan]

Hii Magdalini,

I understand that you want to initialise the value only once and to be precise in the beginning in the stimulation.

I have attached a new links for reference which will help to achieve the result:-

S-FunctionBuilder:- https://in.mathworks.com/help/simulink/slref/sfunctionbuilder.html

mdlInitializeSizes:- https://in.mathworks.com/help/simulink/sfg/mdlinitializesizes.html

Hope this helps!

Answer 2

[Hua Bai]

Maybe you can try to use the discrete state with initial condiciton, and update the discrete state in update method.