Syntax Error in Simulink Fcn block

I am trying to run a simulink block diagram simulation.

I have the following function in a func block: (( Y* (abs(u(nb+1))<Tfault) ) +(( Yf * (abs(u(nb+1))>=Tfault)) & (abs(u(nb+1)) <(Tfault+Tclear) )) + (Ypf * (abs(u(nb+1)) >= (Tfault+Tclear) ))) \ u(1:nb)

Y,Yf,Ypf are matrices

no matter what I do I continue to get a syntax error and I simply cannot see what the problem is. Can someone please tell me what is wrong with this function.

Answer 1

[Fangjun Jiang]

1. Provide values for every variable in the formula, including nb, Tfault, Tclear
2. Provide an instance value of u
3. Run the formula chunck by chunk, like Y* (abs(u(nb+1))<Tfault) and then Yf * (abs(u(nb+1))>=Tfault), and then the next
4. You will find the problem, such as missing a parentheses

[reshma muralidharan]

Thank you sir.