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unitfeedback

PURPOSE

%unitfeedback(sys1)

SYNOPSIS

function out = unitfeedback(sys)

DESCRIPTION

%unitfeedback(sys1)
%
% Creates the System Sys2(s)  from the system Sys1(s)
% when we have a negative feedback. 
%               ____________
%     +   e    |            |         
% u --->0----->|   Sys1(s)  |------------> y
%       ^-     |____________|      |
%       |                          |
%       |                          |
%       |                          |
%       --------------<-------------
%
% and Returns :
%            Y(s)             Sys1(s)
% Sys2(s)=  ------  =  -------------------
%            U(s)         1   +    Sys1(s)
%
%
% the feedback is negative.
%               ____________
%              |            |         
% u ---------->|   Sys2(s)  |------------> y
%              |____________|      
%
% This only works for SISO systems.

CROSS-REFERENCE INFORMATION

This function calls:

is_siso % Returns nonzero if the system data structure
ss % Create system structure from state-space data. May be continuous,
sysconnect % Close the loop from specified outputs to respective specified inputs
sysmult % Compute @math{sys = Asys*Bsys} (series connection):
sysprune % Extract specified inputs/outputs from a system

This function is called by: