import mat-files for initialization

[Lennart Ochel]

Currently, it is not possible to import mat-files for initialization purpose generated by OpenModelica:

loadString("
model test
  Real x(start=2, fixed=true);
equation
  der(x) = 0;
end test;
"); geterrorString();

simulate(test); getErrorString();
simulate(test, simflags="-iif=test_res.mat"); getErrorString();

Output:

Simulation execution failed for model: test
assert            | debug   | unable to read input-file <test_res.mat> [Too few rows in data_2 matrix]

[Lennart Ochel]

Actually, it is not a bug, but a restriction. We cannot read and write to the same file. I will add a warning for that.

[Lennart Ochel]

I added the following error message in r19557:

Simulation execution failed for model: test
LOG_INIT          | error   | It is not possible to import the current result file <test_res.mat> for the initialization.
stdout            | warning | Error in initialization. Storing results and exiting.
|                 | |       | Use -lv=LOG_INIT -w for more information.

[anonymous]

Sorry to reopen a closed report.

The fix in r19557 only checks for modelFilePrefix+"_res.mat" but does not check for when the result file is redirected with the -r flag. If you are redirecting the result file then there (probably) isn't a reason you cannot read from a result file with the same name as the model.

Also, the error message is confusing. It would be nice if it also described how to fix the problem. How about "Cannot import a result file for initialization that is also the current output file. Consider redirecting the output result file <-r new_res.mat> or renaming the result file that is used for initialization import."

[Lennart Ochel]

Thank you for this helpful comment. I improved this in r22413.