function [ret,x0,str,ts,xts]=s4(t,x,u,flag)

s4　　is the M-file descr iption of the SIMULINK system named s4.

　　The block-diagram can be displayed by typing: s4.



　　SYS=s4(T,X,U,FLAG) returns depending on FLAG certain

　　system values given time point, T, current state vector, X,

　　and input vector, U.

　　FLAG is used to indicate the type of output to be returned in SYS.