MATLAB: Indexing cannot yield multiple results matlab

indexingindexing cannot yield multiple results error

i have my function like this;
when i run the the program it gives; Indexing cannot yield multiple results.Error in [Edump,Eb,Ech] = charge(Phkt,Pw,Pp,Ebmax,uinv,Pl,t,PchE,dump,Eb,Ech)
if true
  % code
end
function [Edump,Eb,Ech] = charge(Phkt,Pw,Pp,Ebmax,uinv,Pl,t,PchE,dump,Eb,Ech)
global Phkt Pw Pp Eb Ebmax uinv Pl t Ech 
 %              CHARGE
        Pch(t)=( Pp(t)+Pw(t)+Phkt(t))-(Pl(t)/uinv);
        Ech(t)=Pch(t);%*1;%one hour iteration time
        if Ech(t)<=Ebmax-Eb(t)
            Eb(t)=Eb(t-1)+Ech(t);
            if Eb(t)>Ebmax
                    Eb(t)=Ebmax;
                    Edump(t)=Ech(t)-(Ebmax-Eb(t));
            else
                    Edump(t)=0;
            end
            return
        else
            Eb(t)=Ebmax;
            Edump(t)=Ech(t)-(Ebmax-Eb(t));
            return
        end
end
       [Edump,Eb,Ech] = charge(Pp,Pw,Phkt,Eb,Ebmax,uinv,Pl,t,Edump,Ech);

Best Answer

Why on earth are you declaring a bunch of global variables of the same names as many that you are passing into your function? At best this will do nothing, at worst it will have all kinds of unwanted effects that could cause a load of obscure bugs.
The error you are getting though suggests that when you call
[Edump,Eb,Ech] = charge(Phkt,Pw,Pp,Ebmax,uinv,Pl,t,PchE,dump,Eb,Ech)
Matlab thinks 'charge' is a variable that it is indexing into rather than a function that it is calling. So first thing to check is where you call it do you have a variable called 'charge' also? If so then this is the problem (or at least the problem causing the error you give).
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