Ignoring Errors Generated by an Interpreted MATLAB Function Block in Simulink

I’m using an interpreted MATLAB function block to call a function (refprop) which determines real gas properties of a mixture. So far I have been able to get this block to work most of the time, however as I am operating near the vapor dome, occasionally the refprop function fails to converge on an answer and throws an error. I’m relatively confident that the function will be able to converge on an answer after several more time steps as the gas conditions are continually changing. However as soon as the interpreted MATLAB function block throws an error, the entire Simulink model stops. Is there some way to intercept this error (such as the try/catch function in MATLAB) that would allow me to continue running the simulation even if the function occasionally throws an error? I’ve also tried to use a MATLAB function block but it’s not compatible with the refprop function. Another approach would be to compile lookup tables for the mixture but I’d prefer to call the refprop function directly at this point (speed is not currently a concern).

Thanks for any assistance,

Mike

[Antonio Villalba]

Hi Mike. I'm looking for a solution to the same problem. Any new clue?

Thanks. Antonio

[jonas thiaucourt]

Hi, I'm facing more or less the same issue. This is what I'm doing so far: I ask for the quality (Q) of the vapor phase and when it fails to converge then Q=999 and based on this, I ignore failed values and move on. Regards, Jonas

[Guilnaz Mirmoshtaghi]

@jonas thiaucourt since the error occurs inside refprop, how do you ignore it by putting Q=999?

because as you wrote, it is due to Q value and if we somehow can have a line in code which changes the Q value, then refprop can go on. But how can we change Q inside?