ben3asys.m

数字通信第四版原书的例程

function [ret,x0,str,ts,xts]=ben3asys(t,x,u,flag);
%BEN3ASYS	is the M-file description of the SIMULINK system named BEN3ASYS.
%	The block-diagram can be displayed by typing: BEN3ASYS.
%
%	SYS=BEN3ASYS(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 BEN3ASYS 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 BEN3ASYS with a FLAG of zero:
%	[SIZES]=BEN3ASYS([],[],[],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',[32,103,758,340])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-23')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '4')
set_param(sys,'Min step size', '1e-4')
set_param(sys,'Max step size', '10')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')
set_param(sys,'Load callback','ben3adat');

add_block('built-in/Note',[sys,'/','T1'])
set_param([sys,'/','T1'],...
		'position',[310,15,315,20])

add_block('built-in/Discrete Transfer Fcn',[sys,'/','G3'])
set_param([sys,'/','G3'],...
		'Numerator','gn3',...
		'Denominator','gd3',...
		'Sample time','[T1,offT1]',...
		'position',[150,12,200,48])

add_block('built-in/Discrete Transfer Fcn',[sys,'/','G4'])
set_param([sys,'/','G4'],...
		'orientation',2,...
		'Numerator','gn4',...
		'Denominator','gd4',...
		'Sample time','[T1,offT1]',...
		'position',[320,92,370,128])

add_block('built-in/Discrete Transfer Fcn',[sys,'/','G5'])
set_param([sys,'/','G5'],...
		'orientation',2,...
		'Numerator','gn5',...
		'Denominator','gd5',...
		'Sample time','[T1,offT1]',...
		'position',[320,157,370,193])

add_block('built-in/Discrete Transfer Fcn',[sys,'/','G7'])
set_param([sys,'/','G7'],...
		'orientation',2,...
		'Numerator','gn7',...
		'Denominator','gd7',...
		'Sample time','[T2,offT2]',...
		'position',[430,157,480,193])

add_block('built-in/Discrete Transfer Fcn',[sys,'/','G6'])
set_param([sys,'/','G6'],...
		'orientation',2,...
		'Numerator','gn6',...
		'Denominator','gd6',...
		'Sample time','[T2,offT2]',...
		'position',[430,92,480,128])

add_block('built-in/Step Fcn',[sys,'/','Step'])
set_param([sys,'/','Step'],...
		'Time','0',...
		'position',[40,15,60,35])

add_block('built-in/Note',[sys,'/','T2 '])
set_param([sys,'/','T2 '],...
		'position',[525,80,530,87])

add_block('built-in/Note',[sys,'/','T2'])
set_param([sys,'/','T2'],...
		'position',[525,140,530,147])

add_block('built-in/Note',[sys,'/',' T1 '])
set_param([sys,'/',' T1 '],...
		'position',[390,80,395,87])

add_block('built-in/Note',[sys,'/','T1 '])
set_param([sys,'/','T1 '],...
		'position',[385,145,401,150])

add_block('built-in/Transfer Fcn',[sys,'/','G1, G2'])
set_param([sys,'/','G1, G2'],...
		'Numerator','gn1_gn2',...
		'Denominator','gd1',...
		'position',[420,19,485,61])

add_block('built-in/Sum',[sys,'/','Sum1'])
set_param([sys,'/','Sum1'],...
		'hide name',0,...
		'inputs','2',...
		'position',[285,28,300,52])

add_block('built-in/Sum',[sys,'/','Sum'])
set_param([sys,'/','Sum'],...
		'hide name',0,...
		'inputs','--',...
		'position',[235,23,250,47])

add_block('built-in/Inport',[sys,'/','R'])
set_param([sys,'/','R'],...
		'position',[40,70,60,90])

add_block('built-in/Sum',[sys,'/','Sum2'])
set_param([sys,'/','Sum2'],...
		'hide name',0,...
		'position',[110,20,130,40])

add_block('built-in/Discrete Transfer Fcn',[sys,'/',['Zero Order',13,'Hold']])
set_param([sys,'/',['Zero Order',13,'Hold']],...
		'Numerator','1',...
		'Denominator','1',...
		'Sample time','[T1,offZOH]',...
		'position',[320,22,370,58])

add_block('built-in/Demux',[sys,'/','Demux1'])
set_param([sys,'/','Demux1'],...
		'hide name',0,...
		'outputs','2',...
		'position',[515,18,555,62])

add_block('built-in/To Workspace',[sys,'/','C1 data'])
set_param([sys,'/','C1 data'],...
		'mat-name','C1_data',...
		'buffer','12000',...
		'position',[625,100,685,120])

add_block('built-in/Scope',[sys,'/','C1'])
set_param([sys,'/','C1'],...
		'Vgain','1.270000',...
		'Hgain','4.100000',...
		'Vmax','2.000000',...
		'Hmax','8.200000',...
		'Window',[588,157,848,346],...
		'position',[625,8,660,52])

add_block('built-in/Outport',[sys,'/','C1(t)'])
set_param([sys,'/','C1(t)'],...
		'position',[630,160,650,180])
add_line(sys,[135,30;145,30])
add_line(sys,[65,80;80,80;80,35;105,35])
add_line(sys,[65,25;105,25])
add_line(sys,[315,175;218,175;218,40;230,40])
add_line(sys,[315,110;260,110;260,45;280,45])
add_line(sys,[425,110;375,110])
add_line(sys,[205,30;230,30])
add_line(sys,[305,40;315,40])
add_line(sys,[255,35;280,35])
add_line(sys,[425,175;375,175])
add_line(sys,[375,40;415,40])
add_line(sys,[490,40;510,40])
add_line(sys,[560,50;570,50;570,175;485,175])
add_line(sys,[560,30;595,30;595,110;485,110])
add_line(sys,[560,30;620,30])
add_line(sys,[560,30;595,30;595,170;625,170])
add_line(sys,[595,110;620,110])

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