Frequently Asked Question
Ad = expm(A*Ts)
where,
Ad - discretized state space matrix
A - Continuous state space matrix
Ts - simulation step
expm - matrix exponent
So the discretized state space matrix is obtained via matrix exponent while in Euler method it is obtained by combination of elementary matrix operations.
In the Typhoon HIL environment, the exact method is the default (and therefore recommended) method to use, both in terms of precision and computing load.