Override of start attributes does not work in combination with fixed=true

[Lennart Ochel]

The following model can be used to explore the issue. Using the override flag changes the start value of x, but does not affect the initial solution of x.

loadString("
model foo
  Real x(start=1.0, fixed=true);
  parameter Real p=1.0;
equation
  der(x) = p;
end foo;
"); getErrorString();

simulate(foo, stopTime=0.0, simflags="-override=p=-2,x=0 -lv=LOG_SOTI"); getErrorString();

[Lennart Ochel]

fixed in r22392

[Lennart Ochel]

unfixed in r22403

It is not a good idea to allow to override each start value, since some start expressions in combination to fixed=true affect the initial system structure.

[Martin Sjölund]

We should at least print a warning if a value cannot be overridden (or does not exist, as is also common).

[Lennart Ochel]

Replying to sjoelund.se:

We should at least print a warning if a value cannot be overridden (or does not exist, as is also common).

Yes, that is actually what I want to do. But maybe there is a better solution.

[Lennart Ochel]

This is fixed with ​PR275.
Now, it is possible to override all kind of start values using one of the override flags or an external mat file.

[Martin Sjölund]

Milestone renamed

[Martin Sjölund]

Milestone renamed