example5_32.m

MATLAB7辅助控制系统设计与仿真 第5章

function [ret,x0,str]=simdopi1(t,x,u,flag);
sys = mfilename;
new_system(sys)
simver(1.2)
if(0 == (nargin + nargout))
     set_param(sys,'Location',[100,100,600,400])
     open_system(sys)
end;
set_param(sys,'algorithm',     'RK-45')
set_param(sys,'Start time',    '0.0')
set_param(sys,'Stop time',     '1')
set_param(sys,'Min step size', '0.001')
set_param(sys,'Max step size', '0.01')
set_param(sys,'Relative error','1e-3')
set_param(sys,'Return vars',   '')

add_block('built-in/Inport',[sys,'/','Inport'])
set_param([sys,'/','Inport'],...
		'position',[65,95,85,115])
add_block('built-in/Note',[sys,'/','Doppelintegrator'])
set_param([sys,'/','Doppelintegrator'],...
		'position',[225,10,230,15])
add_block('built-in/Note',[sys,'/','Steuerung'])
set_param([sys,'/','Steuerung'],...
		'position',[75,65,80,70])
add_block('built-in/Integrator',[sys,'/','Integrator1'])
set_param([sys,'/','Integrator1'],...
		'position',[175,95,195,115])
add_block('built-in/Integrator',[sys,'/','Integrator2'])
set_param([sys,'/','Integrator2'],...
		'Initial','-1',...
		'position',[280,95,300,115])
add_line(sys,[90,105;165,105])
add_line(sys,[200,105;270,105])

if (nargin | nargout)
	% 这里必须使用feval访问系统内存
	if (nargin > 3)
		if (flag == 0)
			eval(['[ret,x0,str]=',sys,'(t,x,u,flag);'])
		else
			eval(['ret =', sys,'(t,x,u,flag);'])
		end
	else
		[ret,x0,str] = feval(sys);
	end
end