In my previous post I've run into the problem of not being able to change the initial values of decision variables through GamsModifier when instantiating a ModelInstance.
Namely, GamsModifier(x, UpdateAction.Primal, x_ini) has resulted in errors.
Now I'm back to this issue and planning to directly change the variable levels in ModelInstance sync_db.
Namely I'm writing the following code to replace the functionality of GamsModifier(x, UpdateAction.Primal, x_ini):
for x0 in da.out_db['x_ini']:
mai.sync_db['x'].find_record(x0.keys).level = x0.value
where da is a GamsDataBase containing the values of the parameter x_ini.
Will the changes above be valid to set x.L to the desired values (in x_ini) for the mai.solve() command? Or a GamsModifier is strictly required to make variables modifiable in Python?
I'm planning to initialize the model multiple times inside a loop, otherwise loading from a gdx-file inside of the model text definition could be viable.
Questions on using the GAMS APIs (Python, .NET, etc.)
2 posts • Page 1 of 1
It is a bug that the Python API does not recognize your Primal modifier. This has been fixed and will be available in the next maintenance release.