There are several options:

omc -d=initialization run.mos

or in your script run.mos add it as the first line:

// --- start run.mos script

setCommandLineOptions("-d=initialization"); getErrorString();

// ...

// --- end run.mos script

In OMEdit go Tools->Options->Simulation->Additional Translation Flags: -d=initialization
It seems we forgot to change the warning text after we changed the name of the label in OMEdit, I'll fix it.

Hi adrpo,

Thx a lot for the prompt reply.

Appling your suggestion : "omc -d=initialization run.mos" , the compiler returns :

"Notification: The given system is mixed-determined.   [index = 2]
Warning: Assuming fixed start value for the following 2 variables:
         m.w:DISCRETE(fixed = true )  type: Boolean
         m2.w:DISCRETE(fixed = true )  type: Boolean

I'm a little bit confused as I declared in my module :

" OutputBoolean out;

Boolean w;

initial equation

out = false;
w = false; "

So i can't figure out the reason m.w is set as "true".

Any suggestion / experience ?

Thx a lot again,

Francesco

Is not "m.w" that is set as "true" is its "fixed" attribute that is set to true. Which means it cannot change during initialization.

For example

// non fixed parameter, can change during initialization, starts at 1 but if the solver can find a better value from the other equations it will use that one.

parameter Real a(start = 1, fixed = false);

// fixed parameter, it will fixed during initialization, basically equivalent to: parameter Real a = 1;

parameter Real a(start = 1, fixed = true);

Hi adrpo,

based to your suggestion I declared :

"Boolean w(start = false,fixed = false);"

The compiler returned :

Warning: Assuming fixed start value for the following 2 variables:
         m.w:DISCRETE(start = false fixed = true )  type: Boolean
         m2.w:DISCRETE(start = false fixed = true )  type: Boolean
Warning: The initial conditions are over specified. The following 3 initial equations are redundant, so they are removed from the initialization sytem:
         a.Postiprenotabili = a.prenotabili0
         a.PostiPrenotati = a.prenotati0
         g.capienza = g.cap0.

Even though I set  the variable as " fixed = false " it returned "fixed = true".

Where is my fault  ?  What do you suggest ?

Have a good day ,

Francesco

If you do this:

  Boolean w(start = false, fixed = false);

initial equation

  w = false; // this is overspecified as you already have (start=false).

Then the compiler will detect that w is (fixed=true) during initialization as it has an equation with a constant value.

Basically:

  Boolean w(start = false, fixed = false);

is equivalent to:

  Boolean w(fixed = false);

initial equation

  w = false;

You should use x(fixed = false) only if you need to calculate "x" during initialization from the values of other variables, i.e.

 Boolean x(fixed = false);

initial equation

  x = y and b;

Basically in your case I would do:

  Boolean w(start = false, fixed = true);

and remove the initial equation w = false;

You can read more here:
https://specification.modelica.org/main … -algorithm

Hi adrpo ,

sorry bothering you.

As per your suggestion I removed the initial equation w = false; but the result is still not the expected one.

Indeed I am getting  the following

 Warning: Assuming fixed start value for the following 2 variables:

         m.w:DISCRETE(start = false fixed = true )  type: Boolean

         m2.w:DISCRETE(start = false fixed = true )  type: Boolean

Warning: The initial conditions are over specified. The following 3 initial equations are redundant, so they are removed from the initialization sytem:

         a.Postiprenotabili = a.prenotabili0

         a.PostiPrenotati = a.prenotati0

         g.capienza = g.cap0.

   

What do you think about the above ?

Thanks a lot again ,

Francesco

No bother. Without seeing more of your model is impossible to tell why you get a warning about the redundant equations.
If your model simulate fine even with the warning then just ignore it.

If you can share your model with us we could probably tell you what is wrong.
You can send it via email to OpenModelica @ ida.liu.se and we will have a look
and then delete it after we found the problem. If you cannot send the model then
have a look at the declarations of components:
  a.Postiprenotabili, a.prenotabili0, a.PostiPrenotati, a.prenotati0, g.capienza, g.cap0
and see if they have a start value an what fixed attribute is set to and their use in initial
equation sections.

Hi adrpo,

As per your request I send out my models to the specified email address.

My email is : ****@gmail.com

Have a good day ,

Francesco

Hi adrpo,

Any news for me about the uploaded models ?

Thanks a lot ,

Francesco.

Sorry, I didn't yet had time to look at them. I will try to look into this asap.

Thank you to adrpo ,

The solution is :

Before :

Boolean w;

After :

Boolean w(start=false, fixed=true); 

Thanks a lot again,

Francesco