Re-simulation does not consider updated value

[ceraolo]

Consider the following model

model Test2 
  import Modelica.Constants.pi;
  parameter Real Ipm = 1.5;
  parameter Real varPar (fixed=false);
initial equation
  if Ipm>1.0 then
    varPar=pi/2;
  else
    varPar=asin(Ipm);
  end if;
equation
end Test2;

When run from OMEdit with default simulation parameters (and "Evaluate all parameter at compile time" unchecked) I get for varPar, correctly 1.5708.

Now I change, from the plotting perspective, Ipm from 1.5 to 0.5, and click on re-simulate button.
Then varPar remains at the old value instead of changing into 0.523599.
Checked with Connected to v1.14.0-dev-234 under windows (64 bit)

[Arinomo <trista.arinomo@…>]

Replying to ceraolo:

In the following model I get always varPar=pi/2, whatever value I give Ipm.

model Test2 
  import Modelica.Constants.pi;
  parameter Real Ipm = 1.5;
  parameter Real varPar (fixed=false);
initial equation
  if Ipm>1.0 then
    varPar=pi/2;
  else
    varPar=asin(Ipm);
  end if;
equation
end Test2;

Your model work for me using ver1.14.0-def. With Ipm = 1.5, i got varPar = 1.5708 and for Ipm = 0.5, i've got varPar = 0.523599.Do you have any additional flags set?

[ceraolo]

Well, my report was bad.
I'm going to change name and description of the ticket in the next few minutes.

[Arinomo <trista.arinomo@…>]

Could you test this itteration?

model initParam
  import Modelica.Constants.pi;
  parameter Real Ipm;
  parameter Real varPar(fixed=false);
initial equation
  if Ipm>1.0 then
    varPar=pi/2;
  else
    varPar=asin(Ipm);
  end if;
equation
end initParam;

if I understand it correctly, Re-Simulate doesn't re-build/re-compile your model, since you set Ipm to 1.5, it always take that value. But if you arn't defining Ipm, you can change its value and got a right simualtion result. Or you could set

parameter Real Ipm(start=1.5, fixed=false);

but somehow i cannot cahnge the value if it set to parameter and have a start value.

[ceraolo]

Your initParam works as expected.

I suspect that in this ticket's model Ipm is not changeable since it is used in an if condition and therefore considered to be a structural parameter.
In this case, however, the edit box under the Value column should not appear.

Yes, I'm pretty sure this is the reason. For this I'm going to change again this ticket's description and its priority :-)

[ceraolo]

duplicate of #5454

[Arinomo <trista.arinomo@…>]

Replying to ceraolo:

Your initParam works as expected.

I suspect that in this ticket's model Ipm is not changeable since it is used in an if condition and therefore considered to be a structural parameter.
In this case, however, the edit box under the Value column should not appear.

Yes, I'm pretty sure this is the reason. I'm going to close this ticket.

Just to an idea, you could also define Ipm as input

input Real Ipm(start=1.5,fixed=fasle)

so you can change the value in plotting view. Hope it helps.

[casella]

Replying to ceraolo:

I suspect that in this ticket's model Ipm is not changeable since it is used in an if condition and therefore considered to be a structural parameter.

Absolutely.

In this case, however, the edit box under the Value column should not appear.

That's the subject of #5454, I've added a comment there.