augmented plant to four plants
[P11, P12, P21, P22] = fourplan(P, r)
syslin
list (linear system)
1x2 row vector, dimension of P22
syslin
lists.
Utility function.
P
being partitioned as follows:
with size(P22)=r
this function returns the four linear systems P11,P12,P21,P22
.