Parameters based on externally read parameters are not calculated correctly

[Christian Kral <dr.christian.kral@…>]

Please consider the following example:

model ReadingParameters
  parameter String inputFile = Modelica.Utilities.Files.loadResource("modelica://ReadingParameters/input.dat") "Input data file";
  parameter Modelica.SIunits.Voltage V1 = KeyWordIO.readRealParameter(inputFile, "V1");
  parameter Modelica.SIunits.Voltage V2 = KeyWordIO.readRealParameter(inputFile, "V2");
  final parameter Real n12 = V1 / V2;
end ReadingParameters;

This example relies on the same library to read parameters from external files, as included in #3625.

Please run the attached example. It reads the data file "input.dat" from which the values V1 = 1000 and V2 = 100 are obtained. In this case the ratio n12 = V1/V2 is calculated correctly: n12 = 10

Now, in the data file change the second lint to V2 = 1000, make a right click on the result file in the Variable Browser and "re-simulate" (not re-compile). Then, the new parameters are read correctly, i.e., V1 = 1000 and V2 = 1000. However, the original parameter n12 = 10 remains unchanged, even though n12 should be equal to 1.

[Christian Kral <dr.christian.kral@…>]

Test example

[Christian Kral <dr.christian.kral@…>]

Library to read parameters from external file

[Christian Kral <dr.christian.kral@…>]

Input data file containing parameter values V1 and V2

[Christian Kral <dr.christian.kral@…>]

Neither removing the attribute final of the parameter n12 nor adding annotation(Evaluate=true) change the model behavior.

[Martin Sjölund]

Milestone pushed to 1.9.5

[Martin Sjölund]

Milestone renamed

[Martin Sjölund]

Ticket retargeted after milestone closed

[Martin Sjölund]

Milestone moved to 1.12.0 due to 1.11.0 already being released.

[Francesco Casella]

The milestone of this ticket has been reassigned to "Future".

If you think the issue is still valid and relevant for you, please select milestone 1.13.0 for back-end, code generation and run-time issues, or 2.0.0 for front-end issues.

If you are aware that the problem is no longer present, please select the milestone corresponding to the version of OMC you used to check that, and set the status to "worksforme".

In both cases, a short informative comment would be welcome.