Error with array elements

Index exceeds the number of array elements (1).  

Can someone help me please? Got these errors

Error in odearguments (line 90) f0 = feval(ode,t0,y0,args{:});

% ODE15I sets args{1} to yp0.

Error in ode45 (line 115) odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);

            [~,y]=ode45(@Propuesta, tint, [Vo, X0, S0, Eo, ESo, 0]);
            yyaxis(app.comportamiento, 'left')
            plot(app.comportamiento, y(:,2),'g-', "LineWidth",5)
            ylabel(app.comportamiento, 'Biomasa  g.L^{-1})')
            hold(app.comportamiento) 
            yyaxis(app.comportamiento, 'right')
            plot(app.comportamiento, y(:,3),'r-', 'LineWidth',5)
            plot(app.comportamiento, y(:,6),'m-','LineWidth',5)
            ylabel(app.comportamiento, 'Sustrato & Producto g.L^{-1})')    
            xlabel(app.comportamiento, 'Tiempo (h)')
function dy=Propuesta(~,y)
            V=  y(1);
            X=  y(2);
            S=  y(3);
            E=  y(4);
            ES= y(5);
            P=  y(6);
            
            D=F/V;
            miu=((miumax*S)/(ks+S))*(1-P/kp);
            
            dV=D*V
            dX=(miu-D-kd)*X;
            dS=-((miu/Yxs)+ms)*X+D(Si-S)+(k_1*ES-k1*E*S)/V;
            dE=((k_1+kp)*ES-(k1*E*S))/V;
            dES=(k1*E*ES-(kp+k_1)*ES)/V-ES*D;
            dP=((alpha*miu)+beta)*X-(D*P)+(kp*ES)/V;
            
            dy= [dV;dX;dS;dE;dES;dP]
end

Answer 1

[Walter Roberson]

function dy=Propuesta(~,y)
            V=  y(1);
            X=  y(2);
            S=  y(3);
            E=  y(4);
            ES= y(5);
            P=  y(6);
       

Those variables are all scalars.

            D=F/V;
     

where did F come from? What size is it? It seems most likely that it is a scalar, in which case D would be a scalar.

            miu=((miumax*S)/(ks+S))*(1-P/kp);      

Where did ks and kp come from? What size are they?

            dS=-((miu/Yxs)+ms)*X+D(Si-S)+(k_1*ES-k1*E*S)/V;

Where did Si come from? And other variables in that expression?

And since S is one of the boundary condition, what reason would you have to expect that Si-S would be a non-negative integer such that the expression (Si-S) would be suitable for indexing variable D which seems most likely to be a scalar, but we can't be sure?

[Raquel Bautista]

Yep, those are scalars. I put them with a slide on app designer

[Walter Roberson]

D(Si-S)

means that you want to calculate Si-S and use that as an index into D, but your D is a scalar.

Chances are that you forgot to put in a multiplication.