lab1.m

xnsy算法的matlab实现

function [ret,x0,str,ts,xts]=lab1(t,x,u,flag);
%LAB1	is the M-file description of the SIMULINK system named LAB1.
%	The block-diagram can be displayed by typing: LAB1.
%
%	SYS=LAB1(T,X,U,FLAG) returns depending on FLAG certain
%	system values given time point, T, current state vector, X,
%	and input vector, U.
%	FLAG is used to indicate the type of output to be returned in SYS.
%
%	Setting FLAG=1 causes LAB1 to return state derivatives, FLAG=2
%	discrete states, FLAG=3 system outputs and FLAG=4 next sample
%	time. For more information and other options see SFUNC.
%
%	Calling LAB1 with a FLAG of zero:
%	[SIZES]=LAB1([],[],[],0),  returns a vector, SIZES, which
%	contains the sizes of the state vector and other parameters.
%		SIZES(1) number of states
%		SIZES(2) number of discrete states
%		SIZES(3) number of outputs
%		SIZES(4) number of inputs
%		SIZES(5) number of roots (currently unsupported)
%		SIZES(6) direct feedthrough flag
%		SIZES(7) number of sample times
%
%	For the definition of other parameters in SIZES, see SFUNC.
%	See also, TRIM, LINMOD, LINSIM, EULER, RK23, RK45, ADAMS, GEAR.

% Note: This M-file is only used for saving graphical information;
%       after the model is loaded into memory an internal model
%       representation is used.

% the system will take on the name of this mfile:
sys = mfilename;
new_system(sys)
simver(1.3)
if (0 == (nargin + nargout))
     set_param(sys,'Location',[150,361,659,591])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-45')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '2')
set_param(sys,'Min step size', '0.0001')
set_param(sys,'Max step size', '.01')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')

add_block('built-in/Note',[sys,'/','实验窗口'])
set_param([sys,'/','实验窗口'],...
		'ForeGround',4,...
		'Font Size',18,...
		'position',[250,15,255,20])

add_block('built-in/Step Fcn',[sys,'/','阶跃信号'])
set_param([sys,'/','阶跃信号'],...
		'Time','Start_T',...
		'Before','Init_V',...
		'After','Final_V',...
		'Mask Display','',...
		'Mask Dialogue','阶跃信号：\n  信号在阶跃时刻由初始值跳变到终值。|阶跃时刻：|初始值：|终值：')
set_param([sys,'/','阶跃信号'],...
		'Mask Translate','Start_T=@1;Init_V=@2;Final_V=@3;',...
		'Mask Help','阶跃信号：\n  信号在阶跃时刻由初始值跳变到终值。',...
		'Mask Entries','0\/0\/1\/',...
		'position',[100,50,130,80])

add_block('built-in/Scope',[sys,'/','示波器'])
set_param([sys,'/','示波器'],...
		'Vgain','1.802000',...
		'Hgain','1.512000',...
		'Vmax','2.000000',...
		'Hmax','3.024000',...
		'Window',[365,325,723,637],...
		'position',[275,50,300,80])

add_block('built-in/Transfer Fcn',[sys,'/','S传递函数'])
set_param([sys,'/','S传递函数'],...
		'Drop Shadow',4,...
		'Denominator','[1 1]',...
		'position',[185,47,220,83])
add_line(sys,[135,65;180,65])
add_line(sys,[225,65;270,65])

drawnow

% Return any arguments.
if (nargin | nargout)
	% Must use feval here to access system in memory
	if (nargin > 3)
		if (flag == 0)
			eval(['[ret,x0,str,ts,xts]=',sys,'(t,x,u,flag);'])
		else
			eval(['ret =', sys,'(t,x,u,flag);'])
		end
	else
		[ret,x0,str,ts,xts] = feval(sys);
	end
else
	drawnow % Flash up the model and execute load callback
end