ssGetPWork doesnt work in callbacks mdlInitializeSizes and mdlInitializeSampleTimes

Hello to everyone,

can somebody tell me why in sfunctions I can not store an object in the callbacks mdlInitializeSizes and mdlInitializeSampleTimes? It works in all the other callback.

the code looks like this

static void mdlInitializeSizes(SimStruct *S)
{
  ssSetNumPWork(S, 1); // or ssSetNumPWork(S, DYNAMICALLY_SIZED);
  .....
  ssGetPWork(S)[0] = (void *) new MyClass;
}

Thank you!

G.

Answer 1

[Kaustubha Govind]

I don't believe that work vectors are even allocated until after mdlSetWorkWidths - mdlInitializeSizes and mdlInitializeSampleTimes are in the initialization stage of the S-function where attributes of work vectors can be set (like the number of work vectors, their widths, etc.) which can later be used for allocation.

Is there a reason you'd like to initialize your work vectors so early?

[Giulio]

Thanks for your replay.

In my s-function the initialization depends on the parameters in input. In particular the parameters are manipulated by a method of a class. I would be nice instantiate an object of the class and store it once since I will use it in the other callbacks.

[Kaustubha Govind]

In that case, ssSetUserData and ssGetUserData might be more appropriate.