How to solve this ERROR: Output argument "psi" (and maybe others) not assigned during call to "...".

Hello,

I'm using a simulink model with a Matlab FCN block and have this persistent ERROR:

 *Output argument "psi" (and maybe others) not assigned during call to "blocoControlador2".*

I've already read about this error and still can't understand why continues.

The code:

   function  [psi]  = blocoControlador2( il_in,il_k,psi_in,psi_k )

        a= 7.3421E-6;
        b= 6.2343;
        c= 457.8311;
        d= 25.1627;

        Icc= 10;
        Isat= 694;
        N= 350;

        %psi=0;           % !?!?!?!?
        %state=0;        

        Af=(Isat/N)/(cos((pi/2)*((Isat/N)/Icc)));
        Bf=(pi/2)*(1/Icc);

        f= Af*cos(Bf*il_in);

        caract= a*N*il_in + (b*N*il_in)./(c+d*N*abs(il_in));

        lambAsc= a*N*(il_in-f) + (b*N*(il_in-f))./(c+d.*N*abs(il_in-f));

        lambDesc = a*N*(il_in+f) + (b*N*(il_in+f))./(c+d*N*abs(il_in+f));

              if il_in>il_k && il_in<=(Isat/N)&& psi_in==0
                  psi=0;
                  state=0;
              end
              if il_in>il_k && il_in>(Isat/N) && psi_in< lambAsc && state==0 
                  psi= psi_k;
              end
              if il_in>il_k && il_in>(Isat/N) && psi_in>=lambAsc   
                  psi=lambAsc;
                  state=1;
              end

   end

Basically, I want to initialize "psi" just inside the IF.

If I initialize the variable on the firsts lines (psi=0;) the error disappears but my test conditions will fail.

Is there any way to initialize this variable with a value just for the first time? Like an "initial condition". Because I need to declare "state" inside the IF's too. Same situation.

Thanks in advance!

Answer 1

[Azzi Abdelmalek]

When all the conditions don't match, the variable psi is empty, maybe you should initialize your variable psi to what is needed

[F]

Thanks!!

I add an "else" statement for when all the conditions don't match and it worked.

if... elseif.. elseif... else..