MATLAB: Error dimensions Embedded Matlab function on Simulink

array dimensionsembedded matlab functionerrorsimulink

Hello everybody, I have a code in .m on Matlab and i would like implemented it in an embedded function on simulink. It is ok on Matlab but on simulink not. I have an error concerning the storage and more particularly the dimensions about this storage :
function [Vt_1,Pt_1] = mpp(V,G,T) 
k = 1.381e-23; 
q = 1.602e-19;  
n=1.486; 
Eg = 1.12;  
Ns = 34;
Tref = 298; 
Voc_Tref = 21.6 /Ns;%Module PWX500  

Isc_Tref = 3.1;%Module PWX500  
Va=V/Ns;
Ta=T+273;
Iph_Ta = Isc_Tref* G + (0.00095*(Ta-Tref));
Vt= n*k * Tref / q; 
I0_Tref = Isc_Tref / (exp(Voc_Tref/Vt)-1); 
b = Eg * q/(n*k); 
I0_Ta = I0_Tref * (Ta/Tref)^(3/n) * exp(-b*(1/Ta - 1/Tref)); 
I_cons=1.55;
V_cons=20.1 / Ns;
Vt_e= n*k * Tref / q;
I0_Tre = Isc_Tref / (exp(Voc_Tref/Vt_e)-1);
VD=Vt_e * log(I_cons/I0_Tre);
Rs = (VD-V_cons)/I_cons
Vt_Ta = n * k * Ta / q;  
Ia =0; 
Ia = Ia -(Iph_Ta - Ia - I0_Ta.*( exp((Va+Ia.*Rs)./Vt_Ta) -1))./ (-1 - I0_Ta.*(Rs./Vt_Ta).* exp((Va+Ia.*Rs)./Vt_Ta));
Va=V;
Pa= Va*Ia;
V_2=Va+0.2;
Vt = [];
Pt = [];
for t= 1:46800 %13h
     %G_1=yi(t);
     V_1=V_2;
     V_b=V_1/Ns;
      Iph_Ta = Isc_Tref* G *(1+(0.00095*(Ta-Tref)));   
      I_1=I_1 -(Iph_Ta - I_1 - I0_Ta.*( exp((V_b+I_1.*Rs)./Vt_Ta) -1))./ (-1 - I0_Ta.*(Rs./Vt_Ta).* exp((V_b+I_1.*Rs)./Vt_Ta));
      P_1=V_1*I_1;
     Delta_P=P_1-Pa;
     if Delta_P> 0
         if V_1>Va
       V_2=V_1 + 0.2; %augmente la tension
         else
       V_2=V_1 - 0.2; %diminue la tension

         end
     elseif Delta_P<0
         if V_1>Va
       V_2=V_1 - 0.2; %diminue la tension
         else
       V_2=V_1 + 0.2; %augmente la tension     
         end
     else
         V_2=V_1;
     end
    Va=V_1;
    Pa=P_1;
    Vt =[Vt Va];
    Vt_1=max(Vt);
    Pt = [Pt Pa];
    Pt_1=max(Pt);
    t=t+1;
    %t=0;
      end
  end
I have Vt=[] and Pt=[] and after the loop, I store every variable of Va and Pa in Vt=[Vt Va] and Pt=[Pt Pa]. But on simulink, i have this error :
Computed maximum size is not bounded.
Static memory allocation requires all sizes to be bounded.
The computed size is [1 x :?].
This error may be reported due to a limitation of the underlying analysis.
Thank you for your help,
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