sys2ss

PURPOSE

SYNOPSIS

DESCRIPTION

% -*- texinfo -*-
% @deftypefn {Function File} {[@var{a}, @var{b}, @var{c}, @var{d}, @var{tsam}, @var{n}, @var{nz}, @var{stname}, @var{inname}, @var{outname}, @var{yd}] =} sys2ss (@var{sys})
% Extract state space representation from system data structure.
%
% @strong{Input}
% @table @var
% @item sys
% System data structure.
% @end table
%
% @strong{Outputs}
% @table @var
% @item a
% @itemx b
% @itemx c
% @itemx d
% State space matrices for @var{sys}.
%
% @item tsam
% Sampling time of @var{sys} (0 if continuous).
%
% @item n
% @itemx nz
% Number of continuous, discrete states (discrete states come
% last in state vector @var{x}).
%
% @item stname
% @itemx inname
% @itemx outname
% Signal names (lists of strings);  names of states,
% inputs, and outputs, respectively.
%
% @item yd
% Binary vector; @var{yd}(@var{ii}) is 1 if output @var{y}(@var{ii})
% is discrete (sampled); otherwise  @var{yd}(@var{ii}) is 0.
%
% @end table
% A warning massage is printed if the system is a mixed
% continuous and discrete system.
%
% @strong{Example}
% @example
% octave:1> sys=tf2sys([1 2],[3 4 5]);
% octave:2> [a,b,c,d] = sys2ss(sys)
% a =
%    0.00000   1.00000
%   -1.66667  -1.33333
% b =
%   0
%   1
% c = 0.66667  0.33333
% d = 0
% @end example
% @end deftypefn

CROSS-REFERENCE INFORMATION

• sysdimensions % return the number of states, inputs, and/or outputs in the system
• sysgetsignals % Get signal names from a system
• sysgettsam % Return the sampling time of the system @var{sys}.
• sysupdate % Update the internal representation of a system.

• buildssic %
• c2d %
• ctrb % Build controllability matrix:
• d2c % Convert a discrete (sub)system into a purely continuous one.
• damp % Displays eigenvalues, natural frequencies and damping ratios
• dcgain % Returns dc-gain matrix. If dc-gain is infinite
• dgkfdemo % Octave Controls toolbox demo:
• dlqg % O B S O L E T E * * * D O N O T U S E~
• dmr2d % convert a multirate digital system to a single rate digital system
• dre % Solve the differential Riccati equation
• h2norm % Computes the
• hinfnorm % Computes the
• hinfsyn %
• is_controllable % Logical check for system controllability.
• is_detectable % Test for detectability (observability of unstable modes) of (@var{a}, @var{c}).
• is_dgkf % Determine whether a continuous time state space system meets
• is_observable % Logical check for system observability.
• is_stabilizable % Logical check for system stabilizability (i.e., all unstable modes are controllable).
• is_stable % Returns 1 if the matrix @var{a} or the system @var{sys}
• lqg % Design a linear-quadratic-gaussian optimal controller for the system
• lsim % Produce output for a linear simulation of a system; produces
• ltifr % Linear time invariant frequency response of single-input systems.
• obsv % Build observability matrix:
• place % Computes the matrix @var{K} such that if the state
• series % Forms the series connection of two systems.
• sysappend % appends new inputs and/or outputs to a system
• sysconnect % Close the loop from specified outputs to respective specified inputs
• syscont % Extract the purely continuous subsystem of an input system.
• sysdisc %
• sysdup % Duplicate specified input/output connections of a system
• sysgroup % Combines two systems into a single system.
• sysmin % Returns a minimal (or reduced order) system
• sysmult % Compute @math{sys = Asys*Bsys} (series connection):
• sysout % print out a system data structure in desired format
• sysprune % Extract specified inputs/outputs from a system
• sysrepdemo % Tutorial for the use of the system data structure functions.
• sysscale % scale inputs/outputs of a system.
• tzero % Compute transmission zeros of a continuous system:
• unpacksys % [a,b,c,d] = unpacksys(sys)
• zp2ss % Conversion from zero / pole to state space.