c2ex20.m

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function [ret,x0,str,ts,xts]=c2ex22(t,x,u,flag);
%C2EX22	is the M-file description of the SIMULINK system named C2EX22.
%	The block-diagram can be displayed by typing: C2EX22.
%
%	SYS=C2EX22(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 C2EX22 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 C2EX22 with a FLAG of zero:
%	[SIZES]=C2EX22([],[],[],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',[143,109,643,409])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-45')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '72')
set_param(sys,'Min step size', '0.001')
set_param(sys,'Max step size', '10')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '[t,x,vo]')

add_block('built-in/Step Fcn',[sys,'/','Step Input'])
set_param([sys,'/','Step Input'],...
		'Time','0',...
		'After','0.556',...
		'position',[15,70,35,90])

add_block('built-in/Integrator',[sys,'/','Integrator1'])
set_param([sys,'/','Integrator1'],...
		'position',[70,70,90,90])

add_block('built-in/Gain',[sys,'/','10//RC'])
set_param([sys,'/','10//RC'],...
		'Gain','27.8',...
		'position',[305,72,330,98])

add_block('built-in/Integrator',[sys,'/','Integrator2'])
set_param([sys,'/','Integrator2'],...
		'position',[245,75,265,95])

add_block('built-in/Sum',[sys,'/','Sum'])
set_param([sys,'/','Sum'],...
		'inputs','+-',...
		'position',[195,75,215,95])

add_block('built-in/Gain',[sys,'/','M//B'])
set_param([sys,'/','M//B'],...
		'Gain','.00002',...
		'position',[130,67,155,93])

add_block('built-in/Gain',[sys,'/','Gain'])
set_param([sys,'/','Gain'],...
		'Gain','-1',...
		'position',[345,72,370,98])

add_block('built-in/To Workspace',[sys,'/','To Workspace'])
set_param([sys,'/','To Workspace'],...
		'mat-name','vo',...
		'position',[440,77,490,93])

add_block('built-in/Integrator',[sys,'/','Integrator3'])
set_param([sys,'/','Integrator3'],...
		'position',[385,75,405,95])

add_block('built-in/Gain',[sys,'/','K//B'])
set_param([sys,'/','K//B'],...
		'orientation',2,...
		'Gain','.08',...
		'position',[225,187,250,213])

add_block('built-in/Scope',[sys,'/','Scope1'])
set_param([sys,'/','Scope1'],...
		'Vgain','40.000000',...
		'Hgain','72.000000',...
		'Vmax','80.000000',...
		'Hmax','144.000000',...
		'Window',[71,241,270,359],...
		'position',[130,180,160,210])

add_block('built-in/Scope',[sys,'/','Scope'])
set_param([sys,'/','Scope'],...
		'Vgain','10.000000',...
		'Hgain','72.000000',...
		'Vmax','20.000000',...
		'Hmax','144.000000',...
		'Window',[112,160,443,474])
open_system([sys,'/','Scope'])
set_param([sys,'/','Scope'],...
		'position',[445,175,475,205])
add_line(sys,[160,80;190,80])
add_line(sys,[335,85;340,85])
add_line(sys,[375,85;380,85])
add_line(sys,[40,80;65,80])
add_line(sys,[95,80;125,80])
add_line(sys,[220,85;240,85])
add_line(sys,[270,85;300,85])
add_line(sys,[110,80;110,195;125,195])
add_line(sys,[220,200;170,200;170,90;190,90])
add_line(sys,[285,85;285,200;255,200])
add_line(sys,[410,85;435,85])
add_line(sys,[420,85;420,190;440,190])

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