Modia.jl 0.6.1 instantiatemodel fails

[valfaro]

Programs that run fine under Modlia v0.6.0 do not run now under Modia v0.6.1.

Errors messages include for example: "The number of unknowns (13) and equations (1) is not equal!" "The DAE has no unique solution, because 12 equation(s) missing!"

It seems that at instantiate the model the prefix "up." is added to each unknown variable.

Annexed a CSTR model simulation program for testing. test_modia060.zip

[MartinOtter]

Please check: There is one non-backwards compatible change as stated in the release notes:

• Equations are only recognized under the equations keyword, equations = :[ ... ].
• Previously, any key could be used for the equations, this is no longer possible.

If equations are not recognized, there are not enough equations.

[MartinOtter]

I had a quick look at test_modia060.zip. If you change meq = :[.. ] to equations = :[..], the model will work.

[valfaro]

Thank you for your prompt response.

I find the "equations" keyword requirement back in ModiaLang release V0.11.0 notes but not in Modia V0.6.1. Sorry for the inconvenience.

Please notice that the first two model examples in Modia Tutorial use the keyword "equation".

It seems that for models based only on connection equations, "connect" and "equations" can be used.

[MartinOtter]

I am very sorry, this should not have happened:

• Since the changes are not backwards compatible, the version number 0.6.1is not correct (must be 0.7.0)
• Modia/docs was not adapted to the changes.
• Modia/test was not adapted to the changes (runtests.jl is not successful).

I have fixed these issues now by releasing a new version 0.7.0 and adapted the docs and the tests, so runtests.jl is now successful. I have also written more detailed release notes. Please have especially a look into the non-backwards compatible changes.

It seems that for models based only on connection equations, "connect" and "equations" can be used.

Yes. But I recognized that the "merge" operator should "merge" connect statements. This is done, if the connects are inside equations, but not if key "connect" is used. This can be seen as a bug (I will open a ticket for this issue).