Problem solving with 'care'

I was trying to implement an algorithm which requires the solution of the following equation:

QA + A'Q + (C - B'Q)' (DD')^(-1) (C -B'Q) = 0.; with Q unknown only.

The function 'care' dose not seem to be a solution to this problem. Any help regarding this is highly appreciated.

Regards, Rashed

[Matt J]

CARE looks like it would be applicable to me...

[Md Rasheduzzaman]

Thanks Matt, but I am just not able to rearrange the matrices C, B', Q in a way that they can fit the general riccati equation.

[Md Rasheduzzaman]

This command will do:

lqrc

http://www.mathworks.com/help/control/ref/lqr.html

[Cheetamun Koshal]

Q is a semidefinite positive symmetric matrix and can be set by the user. The values entered affects the quality of response.