Modelica Boolean variable in continuous time

Question

The following Modelica model checks and simulates.

model boolCheck_OK1
  Real a = sin(time);
  Real b = cos(time);
  Real c;
//protected 
//  Boolean isInReg = inRegionCheck(a, b);
equation 
  c = if inRegionCheck(a, b) then 1.3*a^b else 0.7*b^a;
end boolCheck_OK1;

The function inRegionCheck() returns a Boolean, here is a simplified version:

function inRegionCheck
  input Real a;
  input Real b;
  output Boolean c;
algorithm 
   c := a>b;
end inRegionCheck;

In the actual code, the function has more inputs and a longer name and is several lines long and the same check is used several times, so for readability I would like to introduce an intermediate variable as shown in the commented protected section, but that results in an error "Non-real equation in continuous time are not legal".

Any suggestions for an elegant workaround?

Answer 1

Works in SimulationX (with protected Boolean variable isInReg) if the function inRegionCheck is annotated by annotation(GenerateEvents=true);. In Dymola, you need to set annotation(Inline=true,GenerateEvents=true); to make it working.