Output argument is not assigned on some execution paths.

Question

Faiz Akbar Raihananda on 17 Jan 2020

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https://au.mathworks.com/matlabcentral/answers/500805-output-argument-is-not-assigned-on-some-execution-paths

Answered: James Tursa on 17 Jan 2020

Hello, I'm trying to code a controller block on simulink using matlab script, but everytime it runs an error that reads "Output argument 'WT2' is not assigned on some execution paths." pops up. Here is my code..

function [WT2, WT3, WT4]  = Controller(wt1p, WTC, PV, Demand, Pbattery, SOC)
imbalance = abs(Demand) - PV - WTC;
if imbalance > 0                % SHORTAGE, battery starts supplying to bridge imbalance gap
    if 2*wt1p > imbalance >= wt1p 
        WT2 = 1;
        WT3 = 0;
        WT4 = 0;
    elseif 3*wt1p > imbalance >= 2*wt1p
        WT2 = 1;
        WT3 = 1;
        WT4 = 0;
    elseif imbalance >= 3*wt1p
        WT2 = 1;
        WT3 = 1;
        WT4 = 1;
    else                                         %When imbalance < wt1p
        WT2 = 0;         %battery should start supplying in this situation
        WT3 = 0;         %and also when all the wind turbines are on but imbalance >0                       
        WT4 = 0;
    end
elseif imbalance <= 0           %%SURPLUS%%
   if SOC >= 0.75
       if 0 > imbalance >= -wt1p && WTC == 4*wt1p
           WT2 = 1;
           WT3 = 1;
           WT4 = 0;
       elseif 0 > imbalance >= -wt1p && WTC == 3*wt1p
           WT2 = 1;
           WT3 = 0;
           WT4 = 0;
       elseif 0 > imbalance >= -wt1p && WTC == 2*wt1p
           WT2 = 0;
           WT3 = 0;
           WT4 = 0;
       elseif  -wt1p > imbalance >= -2*wt1p && WTC == 4*wt1p %%FINISH THIS YO!!!
           WT2 = 1;
           WT3 = 1;
           WT4 = 0;
       elseif -wt1p > imbalance >= -2*wt1p && WTC == 3*wt1p
           WT2 = 1;
           WT3 = 0;
           WT4 = 0;
       elseif -wt1p > imbalance >= -2*wt1p && WTC == 2*wt1p
           WT2 = 0;
           WT3 = 0;
           WT4 = 0;
       elseif -2*wt1p > imbalance >= -3*wt1p && WTC == 4*wt1p
           WT2 = 1;
           WT3 = 1;
           WT4 = 0;
       elseif -2*wt1p > imbalance >= -3*wt1p && WTC == 3*wt1p
           WT2 = 1;
           WT3 = 0;
           WT4 = 0;
       elseif -2*wt1p > imbalance >= -3*wt1p && WTC == 2*wt1p
           WT2 = 0;
           WT3 = 0;
           WT4 = 0;
       elseif -3*wt1p > imbalance && WTC == 4*wt1p
           WT2 = 1;
           WT3 = 1;
           WT4 = 0;
       elseif -3*wt1p > imbalance && WTC == 3*wt1p
           WT2 = 1;
           WT3 = 0;
           WT4 = 0;
       elseif -3*wt1p > imbalance && WTC == 2*wt1p      
           WT2 = 0;
           WT3 = 0;
           WT4 = 0;
       else                               %if imbalance == 0
           WT2 = 1;    %%%                  
           WT3 = 0;     %%%
           WT4 = 0;      %%%
       end
   else  %if SOC < 75, battery charges (takes adv. of imbalance)
       WT2 = 1;
       WT3 = 1;
       WT4 = 1;
   end
end