error occurs in the present code

2 vues (au cours des 30 derniers jours)
MINATI
MINATI le 23 Fév 2019
Commenté : Rik le 24 Fév 2019
function main
clc
clear all
x=3;
options=optimset('Display','iter');
x1=fsolve(@solver,x,options);
function F=solver(x)
options=odeset('RelTol',le-8,'AbsTol',[le-8, le-8, le-8]);
[t,u]=ode45(@equation,[0,20],[4 -1 x],options);
s=length(t);
F=u(s,2);
figure(1)
plot(t,u(:,2))
hold on
end
end
function dy=equation(t,y)
dy=zeros(3,1);
dy(1)=y(2);
dy(2)=y(3);
dy(3)=y(2)^2-y(1)*y(3);
end
After running the above code following error occurs:
Not enough input arguments.
Error in fsolve (line 230)
fuser = feval(funfcn{3},x,varargin{:});
Error in (line 10)
x1=fsolve(@solver,x,options);
Caused by:
Failure in initial objective function evaluation. FSOLVE cannot continue.

Réponse acceptée

Star Strider
Star Strider le 23 Fév 2019
You have a typographical error in your odeset call. You typed ‘l’ (lower-case ‘L’) instead of the number 1.
Use this instead:
options=odeset('RelTol',1e-8,'AbsTol',1e-8);
and your code runs without error.
When I ran it,, the result was:
x1 =
3.732
  7 commentaires
Star Strider
Star Strider le 24 Fév 2019
It is one of the initial conditions for your ‘equation’ function differential equation system.
Rik
Rik le 24 Fév 2019
Related question in this new thread.

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