Create a list of all current variables and their respective values in FMIKit-Simulink

Question

I am currently using FMIKit for Simulink found here https://github.com/CATIA-Systems/FMIKit-Simulink

From the documentation it works very well to query values of parameters within the FMU using FMIKit.getStartValue(FMUBLOCK, 'Variablename');

but only if you know the name and structure of the variable you are looking for.

I wanted to know if there is a way to extract the full list of variables in the FMU together with their values just before I start the simulation (for sim debugging purposes)?

Answer 1

You can get the start values of the model variables by reading the model description of the FMU (e.g. the VanDerPol.fmu from the FMI 2.0 Test FMUs):

% import the FMU and select the FMU block

% set a different start value for variable "mu"
FMIKit.setStartValue(gcb, 'mu', '1.3');

% read the model description (returns a Java object)
md = FMIKit.getModelDescription('VanDerPol.fmu');

% iterate over the list of variables
for i = 1:md.scalarVariables.size
  v = md.scalarVariables.get(i-1);

  % get the name and start value
  name  = char(v.name);

  % get the start value from the FMU block
  start = FMIKit.getStartValue(gcb, name); % might be empty

  disp([name ': ' start])
end

gives you

x0: 2
der(x0): 
x1: 0
der(x1): 
mu: 1.3