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

Question

F 2014-4-1

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/124010-how-to-solve-this-error-output-argument-psi-and-maybe-others-not-assigned-during-call-to

编辑： Azzi Abdelmalek 2014-4-6

采纳的回答： Azzi Abdelmalek

在 MATLAB Online 中打开

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!