How to generate a identity matrix based on another matrix

Hi, all,

Here is my problem, there is a matrix [1 2 3; 2 3 4],

How to change it into the following matrix

[1 2 3 0 0 0; 0 0 0 2 3 4];

Thanks a lot.

Answer 1

[Stephen23]

You can use blkdiag for this:

>> A = [1 2 3; 2 3 4];
>> B = num2cell(A,2);
>> blkdiag(B{:})
ans =
   1     2     3     0     0     0
   0     0     0     2     3     4

This is not an identity matrix though.

[valley]

thx a lot, this answer is perfect.