a simple vector to a matrix

Hello everyone,

I am trying to write a code that convert a vector like the following for example:

X=[1 2 3];

to a matrix like the following:

Z=[1 0 0 2 0 0 3 0 0;...

0 1 0 0 2 0 0 3 0;...

0 0 1 0 0 2 0 0 3];

Any ideas?

Thanks very much.

Answer 1

[Steven Lord]

X=[1 2 3]; 
I = eye(3);
kron(X, I)

ans = 3×9

1 0 0 2 0 0 3 0 0 0 1 0 0 2 0 0 3 0 0 0 1 0 0 2 0 0 3

kron(I, X)

ans = 3×9

1 2 3 0 0 0 0 0 0 0 0 0 1 2 3 0 0 0 0 0 0 0 0 0 1 2 3

Answer 2

[David Hill]

X-[1 2 3];
Z=zeros(3,3*numel(X));
for k=1:numel(X)
   Z(9*k:-4:9*k-8)=X(k);
end

[MA]

Thanks