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#### How do I create a diagonal matrix with block matricies on the diagonal?

```Hello all,

I need to create a square matrix that has square block matricies
along the diagonal and zeros everywhere else. That is to say, I need
to create a block diagonal matrix where each submatrix is different.
The overall matrix needs to have the form:

M =
- -
| sm1 0 0 |
| 0 sm2 0 |
| 0 0 sm3 |
- -

email me directly(phatphreak74@yahoo.ca).

the phreak
```
 0
8/15/2005 10:07:46 PM
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```phat phreak wrote:
> Hello all,
> I need to create a square matrix that has square block matricies
> along the diagonal and zeros everywhere else.
> The overall matrix needs to have the form:
>
> M =
>  - -
> | sm1 0 0 |
> | 0 sm2 0 |
> | 0 0 sm3 |
>  - -

hi friend,
maybe your problem can be solved by this:

>> M=diag([2 6 8 9])

M =

2     0     0     0
0     6     0     0
0     0     8     0
0     0     0     9

it's very simple, diag(x), where x is a vector, return a matrix with x's
element on the diagonal and zeros everywhere else :P

www.vettigli.tk
```
 0
Im1 (23)
8/15/2005 10:44:41 PM
```phat phreak wrote:
>
>
> Hello all,
>
> I need to create a square matrix that has square block matricies
> along the diagonal and zeros everywhere else. That is to say, I
> need
> to create a block diagonal matrix where each submatrix is
> different.
> The overall matrix needs to have the form:
>
> M =
> - -
> | sm1 0 0 |
> | 0 sm2 0 |
> | 0 0 sm3 |
> - -
>
> Any advice would be greatly appreciated. Either post a reply or
> email me directly(phatphreak74@yahoo.ca).
>
> the phreak

Hi!

Use blkdiag:

a=magic(2);
b=ones(2);
c=hankel(1:2);
D=blkdiag(a,b,c)

HTH

PB
```
 0
PB
8/16/2005 5:42:17 AM

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