comhelp.m

数字通信第四版原书的例程

function [ret,x0,str,ts,xts]=comhelp(t,x,u,flag);
%COMHELP	is the M-file description of the SIMULINK system named COMHELP.
%	The block-diagram can be displayed by typing: COMHELP.
%
%	SYS=COMHELP(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 COMHELP 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 COMHELP with a FLAG of zero:
%	[SIZES]=COMHELP([],[],[],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',[10,673,971,742])
     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',   '')


%     Subsystem  'Click_here3'.

new_system([sys,'/','Click_here3'])
set_param([sys,'/','Click_here3'],'Location',[136,230,381,439])
set_param([sys,'/','Click_here3'],...
		'Mask Display','Close page 1',...
		'Mask Dialogue','eval(''if exist(''''compage1''''), bdclose(''''compage1''''); end;'')')


%     Finished composite block 'Click_here3'.

set_param([sys,'/','Click_here3'],...
		'ForeGround',6,...
		'hide name',0,...
		'Font Angle','italic',...
		'position',[20,40,120,66])


%     Subsystem  'Click_here4'.

new_system([sys,'/','Click_here4'])
set_param([sys,'/','Click_here4'],'Location',[136,230,381,439])
set_param([sys,'/','Click_here4'],...
		'Mask Display','Tutorial page 1',...
		'Mask Dialogue','eval(''compage1'')')


%     Finished composite block 'Click_here4'.

set_param([sys,'/','Click_here4'],...
		'ForeGround',6,...
		'hide name',0,...
		'Font Angle','italic',...
		'position',[20,10,120,36])


%     Subsystem  'Click_here1'.

new_system([sys,'/','Click_here1'])
set_param([sys,'/','Click_here1'],'Location',[136,230,381,439])
set_param([sys,'/','Click_here1'],...
		'Mask Display','Tutorial page 2',...
		'Mask Dialogue','eval(''compage2'')')


%     Finished composite block 'Click_here1'.

set_param([sys,'/','Click_here1'],...
		'ForeGround',6,...
		'hide name',0,...
		'Font Angle','italic',...
		'position',[130,10,230,36])


%     Subsystem  'Click_here2'.

new_system([sys,'/','Click_here2'])
set_param([sys,'/','Click_here2'],'Location',[136,230,381,439])
set_param([sys,'/','Click_here2'],...
		'Mask Display','Close page 2',...
		'Mask Dialogue','eval(''if exist(''''compage2''''), bdclose(''''compage2''''); end;close all'')')


%     Finished composite block 'Click_here2'.

set_param([sys,'/','Click_here2'],...
		'ForeGround',6,...
		'hide name',0,...
		'Font Angle','italic',...
		'position',[130,40,230,66])


%     Subsystem  'Click_here6'.

new_system([sys,'/','Click_here6'])
set_param([sys,'/','Click_here6'],'Location',[136,230,381,439])
set_param([sys,'/','Click_here6'],...
		'Mask Display','Tutorial page 3',...
		'Mask Dialogue','eval(''compage3'')')


%     Finished composite block 'Click_here6'.

set_param([sys,'/','Click_here6'],...
		'ForeGround',6,...
		'hide name',0,...
		'Font Angle','italic',...
		'position',[245,10,345,36])


%     Subsystem  'Click_here5'.

new_system([sys,'/','Click_here5'])
set_param([sys,'/','Click_here5'],'Location',[136,230,381,439])
set_param([sys,'/','Click_here5'],...
		'Mask Display','Close page 2',...
		'Mask Dialogue','eval(''if exist(''''compage3''''), bdclose(''''compage3''''); end;if exist(''''tutbchcd''''),bdclose(''''tutbchcd'''');end;'')')


%     Finished composite block 'Click_here5'.

set_param([sys,'/','Click_here5'],...
		'ForeGround',6,...
		'hide name',0,...
		'Font Angle','italic',...
		'position',[245,40,345,66])

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