Dear all:
I have a problem which can be simplified to the statement below (the real equations and functions are much more complicated):
System: dot_X1 = -A*X1; dot_X2 = B*(X2-5) + u;
dot_ means differentiate with time t, X1 and X2 are system states respectively, A and B are both intermediate variables, u is the system control input which can be a ramp or step input defined by myself.
I know how to use ode to solve normal similar problems when A and B and not coupled, for example, when A and B are only functions of X1, X2 and u respectively. But now in my problem, A and B are coupled, like:
A = f(X1, X2, u, B), B = g(X1, X2, u, A), f and g are very complicated functions.
Now in every time interval when solving the ode problem, for example, [0s, 0.01s], I have to calculate both A and B in order to use ode function in matlab. But since A and B are coupled and f and g are very complicated, I don't know how to deal with this.
Could you give me some help? Thanks a lot!
