% -*- texinfo -*-
% @deftypefn {Function File} {[@var{y}, @var{x}] =} lsim (@var{sys}, @var{u}, @var{t}, @var{x0})
% Produce output for a linear simulation of a system; produces
% a plot for the output of the system, @var{sys}.
%
% @var{u} is an array that contains the system's inputs. Each row in @var{u}
% corresponds to a different time step. Each column in @var{u} corresponds to a
% different input. @var{t} is an array that contains the time index of the
% system; @var{t} should be regularly spaced. If initial conditions are required
% on the system, the @var{x0} vector should be added to the argument list.
%
% When the lsim function is invoked a plot is not displayed;
% however, the data is returned in @var{y} (system output)
% and @var{x} (system states).
% @end deftypefn