MATLAB: How to make diagonal matrices from a single column

diagonal martix

I want to make multiple diagonal matrices from a single colimn.

A=[1;2;3;4;5;6;7;8]

From this…

I want to make…

B=[1 0; 0 2]; [3 0; 0 4]; [5 0;0 6]; [7 0;0 8]

Then,

Each diagonal matrix is to be vertically attached.

So, from 10*1 to 10*2.

How can I do that?

Thanks,

B = zeros(8,2);
B(1:2:end,1) = A(1:2:end);
B(2:2:end,2) = A(2:2:end);

A=[1 0 0 0
  2 3 0 0
  4 5 6 0
  7 8 9 10]
[n,m]=size(A);
B=A'+A
B(1:n+1:end)=diag(A)

This is very easy, if the off-diagonal element are always zeros:

m = 5;
b = rand(m,1);
a = diag(b);

But if you want a more general way to insert b along the diagonal of any array a, then here's one way:

m = 5;
% Set up the array and vector:
a = magic(m);
b = rand(m,1);
% Insert vector into main diagonal of array
a(1:m+1:end) = b;

Another way to do the last step is:

a(logical(eye(m))) = b;