MATLAB: CAT arguments dimensions are not consistent using mldivide

dimensions not consistentmldivide

My code is
    for i=1:100;
        dt=2;
        A=[e11(1,1) e12(1,1) 0 0;
        e21(1,1) e22(1,1) 0 0;
        0 e32(1,1) e33(1,1) 0;
        0 e42(1,1) e43(1,1) e44(1,1)];
        B=[((qf-qs)*dt)+(e11(1,1)*Vwt(1,i))+(e12(1,1)*p(1,i));
        ((Q+qf*hf-qs*hs(1,i))*dt)+(e21(1,1)*Vwt(1,i))+(e22(1,1)*p(1,i));
        ((Q-ar(1,1)*hc(1,1)*qdc(1,1))*dt)+(e32(1,1)*p(1,i))+(e33(1,1)*ar(1,i));
        ((Ps*(Vsd0-Vsd(1,1))*dt)/Td)+(((hf-hw(1,1))*qf*dt)/hc(1,1))+(e42(1,1)*p(1,i))+(e43(1,1)*ar(1,i))+(e44(1,1)*Vsd(1,i))];
        x=mldivide(A,B);
        Vwt(1,i+1)=x(1,1);
        p(1,i+1)=x(2,1);
        ar(1,i+1)=x(3,1);
        Vsd(1,i+1)=x(4,1);
        Vst(1,i+1)=Vt-Vwt(1,i+1);
  end
The error shown is
??? Error using ==> vertcat
CAT arguments dimensions are not consistent.
Error in ==> boiler at 124 B=[((qf-qs)*dt)+(e11(1,1)*Vwt(1,i))+(e12(1,1)*p(1,i)); Please help

Best Answer

Without values of e12, e21, e22, etc. we cannot find out why this error is thrown.
Here are some links on debugging in Matlab
.
Add the following lines before B=[((qf- ...
    disp( size((qf-qs)*dt)+(e11(1,1)*Vwt(1,i))+(e12(1,1)*p(1,i)));
    disp( size((Q+qf*hf-qs*hs(1,i))*dt)+(e21(1,1)*Vwt(1,i))+(e22(1,1)*p(1,i)));
    disp( size((Q-ar(1,1)*hc(1,1)*qdc(1,1))*dt)+(e32(1,1)*p(1,i))+(e33(1,1)*ar(1,i)));
    disp( size((Ps*(Vsd0-Vsd(1,1))*dt)/Td)+(((hf-hw(1,1))*qf*dt)/hc(1,1))+(e42(1,1)*p(1,i))+(e43(1,1)*ar(1,i))+(e44(1,1)*Vsd(1,i)));
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