User`s guide

lft
11-116
The abbreviated syntax
sys = lft(sys1,sys2)
produces:
• The lower LFT of
sys1 and sys2 if sys2 has fewer inputs and outputs than
sys1. This amounts to deleting and in the above diagram.
• The upper LFT of
sys1 and sys2 if sys1 has fewer inputs and outputs than
sys2. This amounts to deleting and in the above diagram.
Algorithm The closed-loop model is derived by elementary state-space manipulations.
Limitations There should be no algebraic loop in the feedback connection.
See Also connect Derive state-space model for block diagram
interconnection
feedback Feedback connection
w
2
z
2
w
1
z
1
sys1
sys2
u
y
u
y
z
1
z
2
w
2
w
1
sys1
sys2
Lower LFT connection
Upper LFT connection