resetint.m

数字通信第四版原书的例程

function [ret,x0,str,ts,xts]=resetint(t,x,u,flag);
%RESETINT	is the M-file description of the SIMULINK system named RESETINT.
%	The block-diagram can be displayed by typing: RESETINT.
%
%	SYS=RESETINT(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 RESETINT 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 RESETINT with a FLAG of zero:
%	[SIZES]=RESETINT([],[],[],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.
%	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',[21,297,408,529])
     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', '.1')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')


%     Subsystem  ['Resettable',13,'integrator'].

new_system([sys,'/',['Resettable',13,'integrator']])
set_param([sys,'/',['Resettable',13,'integrator']],'Location',[232,509,633,687])

add_block('built-in/Switch',[sys,'/',['Resettable',13,'integrator/Switch']])
set_param([sys,'/',['Resettable',13,'integrator/Switch']],...
		'Threshold','eps',...
		'position',[200,29,225,61])

add_block('built-in/Reset integrator',[sys,'/',['Resettable',13,'integrator/Reset',13,'integrator']])
set_param([sys,'/',['Resettable',13,'integrator/Reset',13,'integrator']],...
		'Initial','init',...
		'position',[275,54,315,86])

add_block('built-in/Outport',[sys,'/',['Resettable',13,'integrator/out_1']])
set_param([sys,'/',['Resettable',13,'integrator/out_1']],...
		'position',[345,60,365,80])

add_block('built-in/Inport',[sys,'/',['Resettable',13,'integrator/in_3']])
set_param([sys,'/',['Resettable',13,'integrator/in_3']],...
		'Port','3',...
		'position',[200,110,220,130])

add_block('built-in/Relational Operator',[sys,'/',['Resettable',13,'integrator/equal']])
set_param([sys,'/',['Resettable',13,'integrator/equal']],...
		'Operator','==',...
		'position',[140,69,170,91])

add_block('built-in/Inport',[sys,'/',['Resettable',13,'integrator/in_1']])
set_param([sys,'/',['Resettable',13,'integrator/in_1']],...
		'position',[45,25,65,45])

add_block('built-in/Inport',[sys,'/',['Resettable',13,'integrator/in_2']])
set_param([sys,'/',['Resettable',13,'integrator/in_2']],...
		'Port','2',...
		'position',[45,95,65,115])
add_line([sys,'/',['Resettable',13,'integrator']],[70,105;250,105;250,70;270,70])
add_line([sys,'/',['Resettable',13,'integrator']],[115,105;115,75;135,75])
add_line([sys,'/',['Resettable',13,'integrator']],[175,80;175,45;195,45])
add_line([sys,'/',['Resettable',13,'integrator']],[320,70;340,70])
add_line([sys,'/',['Resettable',13,'integrator']],[225,120;260,120;270,80])
add_line([sys,'/',['Resettable',13,'integrator']],[70,35;195,35])
add_line([sys,'/',['Resettable',13,'integrator']],[230,45;250,45;250,60;270,60])
set_param([sys,'/',['Resettable',13,'integrator']],...
		'Mask Display','Resettable\nintegrator',...
		'Mask Type','Resettable integrator')
set_param([sys,'/',['Resettable',13,'integrator']],...
		'Mask Dialogue','Integrates first input. If second input is not zero, integration stops and state is set to third input.|Initial value:',...
		'Mask Translate','init = @1;')
set_param([sys,'/',['Resettable',13,'integrator']],...
		'Mask Help','RESETTABLE INTEGRATOR  The resettable integrator is a masked function. This block has same functionality as the built-in RESET INTEGRATOR except that when input 2 is non-zero, the block stops integration.')
set_param([sys,'/',['Resettable',13,'integrator']],...
		'Mask Entries','15\/')


%     Finished composite block ['Resettable',13,'integrator'].

set_param([sys,'/',['Resettable',13,'integrator']],...
		'position',[135,22,210,78])

add_block('built-in/Note',[sys,'/',['NOTE: This block is different from the built-in Reset-integrator.',13,'When the second input is non-zero, this block resets state and',13,'stops integration, while the reset integrator reset state only.     ']])
set_param([sys,'/',['NOTE: This block is different from the built-in Reset-integrator.',13,'When the second input is non-zero, this block resets state and',13,'stops integration, while the reset integrator reset state only.     ']],...
		'position',[190,110,195,115])

add_block('built-in/Note',[sys,'/',['T_(i+1)     ',13,'INT           U_1(t) dt',13,'T_i        ']])
set_param([sys,'/',['T_(i+1)     ',13,'INT           U_1(t) dt',13,'T_i        ']],...
		'position',[170,180,175,185])

add_block('built-in/Note',[sys,'/',['The difference between the output of this block and the built-in',13,'Reset-integrator block is one step integration value, or,           ']])
set_param([sys,'/',['The difference between the output of this block and the built-in',13,'Reset-integrator block is one step integration value, or,           ']],...
		'position',[190,150,195,155])

% 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
end