sylv

Scilab Function
Last update : 25/04/2007

sylv - Sylvester equation.

### Calling Sequence

  `sylv(A,B,C,flag)`

### Parameters

- `A,B,C` : three real matrices of appropriate dimensions.
- `flag` character string (`'c'` or `'d'` )

### Description

`X = sylv(A,B,C,'c')` computes `X` , solution of the "continuous time" Sylvester equation

    A*X+X*B=C

`X=sylv(A,B,C,'d')` computes `X` , solution of the "discrete time" Sylvester equation

    A*X*B-X=C

### Examples

    A=rand(4,4);C=rand(4,3);B=rand(3,3);
    X = sylv(A,B,C,'c');
    norm(A*X+X*B-C)
    X=sylv(A,B,C,'d')
    norm(A*X*B-X-C)

### See Also

`lyap` ,