I understand that you want to know why your simulation got terminated with the domain error due to ‘sqrt’ function.
The MATLAB ‘sqrt’ function can operate on non-negative real numbers. But it throws a domain error in the physical modelling of a system when it encounters a non-negative input as its corresponding output will be a complex number.
The above error message indicates that the value of the variable ‘x’ is considered as a real number by default. But the actual value of ‘x’ being passed in the MATLAB Function2 block is a negative number whose square root will result in a complex number.
To resolve this issue, you need to modify the MATLAB ‘Function2’ block in the model such that the variable ‘x’ is never negative (setting ‘x’ to zero or a positive value if it is negative) or modify the code sqrt(x) to sqrt(complex(x) ). In this way it treats ‘x’ as complex and allows ‘sqrt’ to return a complex result.
You can refer the below link which indicates the usage of ‘sqrt’ function.
Hope this clarifies the error.
