lab01.m

xnsy算法的matlab实现

function [ret,x0,str,ts,xts]=lab01(t,x,u,flag);
%LAB01	is the M-file description of the SIMULINK system named LAB01.
%	The block-diagram can be displayed by typing: LAB01.
%
%	SYS=LAB01(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 LAB01 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 LAB01 with a FLAG of zero:
%	[SIZES]=LAB01([],[],[],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',[11,120,141,456])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-45')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '999999')
set_param(sys,'Min step size', '0.0001')
set_param(sys,'Max step size', '10')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')

add_block('built-in/Note',[sys,'/','输入设备'])
set_param([sys,'/','输入设备'],...
		'ForeGround',4,...
		'Font Size',14,...
		'position',[77,20,82,25])

add_block('built-in/Signal Generator',[sys,'/','信号发生器'])
set_param([sys,'/','信号发生器'],...
		'Peak','1.000000',...
		'Peak Range','5.000000',...
		'Freq','1.000000',...
		'Freq Range','5.000000',...
		'Wave','Sin',...
		'Units','Rads',...
		'position',[50,148,95,182])

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',[55,75,85,105])

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