Hello Francesca,
I understand that you are trying to simulate an exothermal reaction in MATLAB.
You are getting an error that “region” is not a recognised variable. This is because “region” is not predefined. It is not part of any toolbox and hence MATLAB sees it as a variable and expects an initiation/declaration. Same error will be thrown for “state” variable also. Both these variables are used in defining an anonymous function handle and hence will be just placeholder variables for the function inputs. Hence when calling “qfunc()” with these variables in “internalHeatSource” function will give an error.
The second input of the function call “internalHeatSource” expects a function handle or a value. In your case if you want to input the function handle then “qfunc” should be directly given as an input instead of “qfunc(region,state)”. This might be the error because MATLAB is treating it as a value and hence is looking for some values for “region” and “state” variables. It can be corrected as below:
internalHeatSource(modelT,qfunc,'Face',2);
Regarding the other error, since “isempty” is not being called directly it is being called as part of another function. Breakpoints can be used to debug and find out where it is being called. “isempty” only accepts one input which is an array and returns a logical 1 or 0 based on whether the array is empty or not. Look for the place where this is getting violated. Fixing the above function call might also fix this error.
You can refer to the below documentation to learn more :
- Thermal Model: https://www.mathworks.com/help/pde/ug/pde.thermalmodel.html
- Internal Heat Source function: https://www.mathworks.com/help/pde/ug/pde.thermalmodel.internalheatsource.html#:~:text=heatSourceValue%20%E2%80%94%20Heat%20source%20value
- Passing function handles to function: https://www.mathworks.com/help/matlab/matlab_prog/pass-a-function-to-another-function.html#:~:text=Also%2C%20you%20can%20pass%20a%20handle%20to%20an%20anonymous%20function%20to%20function%20functions.
Hope this helps.
Thanks,
Charan.
