rlocus

% -*- texinfo -*-
% @deftypefn {Function File} {[@var{rldata}, @var{k}] =} rlocus (@var{sys}[, @var{increment}, @var{min_k}, @var{max_k}])
%
% Display root locus plot of the specified @acronym{SISO} system.
% @example
% @group
%        -----   ---     --------
%    --->| + |---|k|---->| SISO |----------->
%        -----   ---     --------        |
%        - ^                             |
%          |_____________________________|
% @end group
% @end example
%
% @strong{Inputs}
% @table @var
% @item sys
% system data structure
% @item min_k
% Minimum value of @var{k}
% @item max_k
% Maximum value of @var{k}
% @item increment
% The increment used in computing gain values
% @end table
%
% @strong{Outputs}
%
% Plots the root locus to the screen.
% @table @var 
% @item rldata
% Data points plotted: in column 1 real values, in column 2 the imaginary values.
% @item k
% Gains for real axis break points.
% @end table
% @end deftypefn