i am getting an error while executing a short code to update a matrix, In an assignment A(I) = B, the number of elements in B and I must be the same. Er

A = [0 1 1 1 ;0 0 0 1 ;0 1 0 1 ;0 0 0 0];
N=4; C=2;
rho=0.1;
B= zeros(N,C);
a=[1 0;0 1;1 1;0 1]
for k=1:N-1
    B(k+1) = B(k) + (0.5 * rho* a);
end

Answer 1

[bio lim]

Not sure if this is what you are trying to do, but I am taking Torsten's approach.

A=[0 1 1 1 ;0 0 0 1 ;0 1 0 1 ;0 0 0 0]; 
N=4; 
C=2; 
rho=0.1; 
B=zeros(N,C,N); 
a=[1 0;0 1;1 1;0 1];
for k=1:N-1 
  B(:,:,k+1) = B(:,:,k) + (0.5 * rho* a); 
end

[aqib javed]

 B=zeros(4,2); 
a=[1 0;0 1;1 1;0 1]; 
for k=1:3 
  B(k+1) = B(k) + (0.5 * a); 
end
Please have a look at simple one, i am to update B, why it does not update it,
(Thanks for the previous answer)

[bio lim]

You are making mistakes with indices. Think about the operation you are trying to do here.

B(k+1) = B(k) + (0.5 * a);

a is a matrix, but B(k) gives you a single element of your B matrix. Hence; this operation will give you an error. What you can do is make B a cell matrix.

Aside from that, B is getting updated in the top code.

    B(:,:,1) =

       0     0
       0     0
       0     0
       0     0

B(:,:,2) =

           0.05            0
              0         0.05
           0.05         0.05
              0         0.05

B(:,:,3) =

            0.1            0
              0          0.1
            0.1          0.1
              0          0.1

B(:,:,4) =

           0.15            0
              0         0.15
           0.15         0.15
              0         0.15

[aqib javed]

ahan, very nice explanation, i am grateful to you sir, Problem solved now, thanks again

Answer 2

[Torsten]

You mean

A=[0 1 1 1 ;0 0 0 1 ;0 1 0 1 ;0 0 0 0]; 
N=4; 
C=2; 
rho=0.1; 
B=zeros(N,N,C); 
a=[1 0;0 1;1 1;0 1] 
for k=1:N-1 
  B(k+1,:,:) = B(k,:,:) + (0.5 * rho* a); 
end

?

Best wishes

Torsten.

[aqib javed]

Thanks sir for sparing time from your routine, problem solved now