Storing values through a loop

I wrote this program to store values in a loop and then plot them but I keep getting an error "In an assignment A(I) = B, the number of elements in B and I must be the same." for B(i),S(i) and B(i). Any ideas?

Ks=75; um=1.5; a=0.013; Si=100;  Bi=10; D0=0.02; DD=0.02; Dmax=1.2; t=1;
Dm=D0:DD:Dmax;
for i= 1:length(Dm - 1) %it stops when D>Dmax %in W

    B(i)=Bi;
    S(i)=Si;
    Y=0;

    while 1%in Z
         u=(um*S(i)/(Ks+S(i)));

         if (abs(u-D(i))<=0.001)
            B0(i)=D(i)*B(i);
            D(i)=D(i)+DD;
            break 
             %return from the while loop
         else
            Y=Y+1;
            if Y>50
                B0(i)=D(i)*B(i);
                D(i)=D(i)+DD;
                break
                 %return from the while loop
            else

                Bd=((u*B(i))-(D*B(i)))*t;
                Sd=((Si*D(i))-(S(i)*D(i))-(u*B(i)*a))*t;
                B(i)= B(i)+Bd;
                S(i)= S(i)+Sd; 
                D(i)= D(i)+DD;     

            end

         end
     end
end

 plot(D,B0,D,B,D,S)

[Paulo Silva]

What's the initial D value?

[Paulo Silva]

I tested with D=0*Dm and it gives the error you talk about

[Rudy]

Initial D is 0.02, forgot to put D(i)=D0;

Answer 1

[Paulo Silva]

Bd size is [1 60] and B is [1 60] so you cant store more than one Bd value inside B, please consider something like this

B(i,:)= Bd; %don't forget to pre-allocate the arrays