Error in a code for (Tunnel diode system)

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Mo'ath Al-Hayek
Mo'ath Al-Hayek 2021-2-9
评论： Mo'ath Al-Hayek 2021-2-10
the first script is
function [xtd] = tunnel_diode_system(t,x)
h=@(z) 17.76*z-103.79*z^2+229.62*z^3-226.31*z^4+83.72*z^5;
xtd= [0.5*(-h(x(1))+x(2)); 0.2*(-x(1)-1.5*x(2)+1.2)];
end
The second script is:
clf;
axis([-.4 1.6 -.4 1.6]);
plot (0.882,0,21,'or',0.063,0,758,'ob');
hold on;
button =1;
options=odeset('AbsTol',1e-8,'RelTol',1e-6);
while button==1;
[xinit(1),xinit(2),button] = ginput(1);
if button ~= 1 break;end;
[t,u]=ode45(@tunnel_diode_system,[0 40],xinit,options);
plot(u(:,1),u(:,2))
[t,u]=ode45(@tunnel_diode_system,[0 40],xinit,options);
plot(u(:,1),u(:,2))
end
I get this error when I run the first script:
Not enough input arguments.
Error in tunnel_diode_system (line 4)
xtd= [0.5*(-h(x(1))+x(2)); 0.2*(-x(1)-1.5*x(2)+1.2)];
and I get this error when I run the second script:
Error using plot
Data must be a single matrix Y or a list of pairs X,Y.
Error in Untitled (line 3)
plot (0.882,0,21,'or',0.063,0,758,'ob');
They are both together, any suggestions?
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Walter Roberson
Walter Roberson 2021-2-10
This is not an official support channel; you should not expect Mathworks to reply.

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回答（1 个）

darova
darova 2021-2-10
Here is the mistake
Use dot instead of comma
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Walter Roberson
Walter Roberson 2021-2-10
clf;
axis([-.4 1.6 -.4 1.6]);
plot (0.882,0,21,'or',0.063,0,758,'ob');
hold on;
options = odeset('AbsTol',1e-8,'RelTol',1e-6);
while true
[tx, ty, button] = ginput(1);
if isempty(tx) || isempty(button) || button ~= 1
break
end
xinit = [tx(1), ty(1)];
[t,u]=ode45(@tunnel_diode_system,[0 40],xinit,options);
plot(u(:,1),u(:,2))
[t,u]=ode45(@tunnel_diode_system,[0 40],xinit,options);
plot(u(:,1),u(:,2))
end

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