if any variable in state space then how to solve problem

Xdot1=A*X1+B*u;

Y=C*X1+D*u;

Where a=10;

B=28;

P=8/3;

Where A=[-a a 0; b-z -1 0; y 0 –p]

how to resolve the problem

[Walter Roberson]

How are b p y z related to B P Y Z?

[shiv gaur]

Where a=10;

b=28;

P=8/3;

B=0;

D=0;

Where A=[-a a 0; b-z -1 0; y 0 –p]

Xdot1=[ Xdot;Ydot; Zdot];

X1=[X;Y;Z];

C=[1 1 1];

X1=[X;Y;Z];

[Walter Roberson]

It looks to me that MATLAB only provides linear state-space models, but that you have nonlinear state space.

[shiv gaur]

this is the lorenz problem if you solve my state sapace model highly appreciation

[Walter Roberson]

I know it is the lorenz chaotic system; I recognize it from the other places that I told you that you were posting it too many places.

The lorenz chaotic system requires multiplying two of the variables together. That makes it nonlinear, and the functions such as ss() only handle linear state spaces. There is a theory of nonlinear state spaces but the Control System Toolbox does not implement that theory.

I do not wish to implement that nonlinear ss theory on your behalf; it would take me a fair bit of study.