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starp

PURPOSE ^

%

SYNOPSIS ^

function sys = starp (P, K, ny, nu);

DESCRIPTION ^

% -*- texinfo -*-
% @deftypefn {Function File} {} starp (@var{P}, @var{K}, @var{ny}, @var{nu})
%
% Redheffer star product or upper/lower LFT, respectively.
% @example
% @group
%
%                +-------+
%      --------->|       |--------->
%                |   P   |
%           +--->|       |---+  ny
%           |    +-------+   |
%           +-------------------+
%                            |  |
%           +----------------+  |
%           |                   |
%           |    +-------+      |
%           +--->|       |------+ nu
%                |   K   |
%      --------->|       |--------->
%                +-------+
% @end group
% @end example
% If @var{ny} and @var{nu} ``consume'' all inputs and outputs of
% @var{K} then the result is a lower fractional transformation. 
% If @var{ny} and @var{nu} ``consume'' all inputs and outputs of 
% @var{P} then the result is an upper fractional transformation.
%
% @var{ny} and/or @var{nu} may be negative (i.e. negative feedback).
% @end deftypefn

CROSS-REFERENCE INFORMATION ^

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