MATLAB: Too many output arguments ode23t

ode23t

I am using this function
function maxh_d(t,x)
dxdt = zeros(2,1); % x(1) refers to x ,x(2) refers to p
dxdt(1)= -x(1) ; %+u
dxdt(2)= 2*x(1)*x(2);
end
in this code
[t_v,x_v] = ode23t(@(t,x) maxh_d(t,x), [0 10], [0.5 0.5]);
figure('Name','Nonlinear');
subplot(2,1,1)
plot(t_v, x_v(:,1));
I am getting this error
Error using maxh_d
Too many output arguments.
Error in mh_result>@(t,x)maxh_d(t,x) (line 1)
[t_v,x_v] = ode23t(@(t,x) maxh_d(t,x), [0 10], [0.5 0.5]);
Error in odearguments (line 90)
f0 = feval(ode,t0,y0,args{:}); % ODE15I sets args{1} to yp0.
Error in ode23t (line 143)
odearguments(FcnHandlesUsed, solver_name, ode, tspan, y0, options, varargin);
Error in mh_result (line 1)
[t_v,x_v] = ode23t(@(t,x) maxh_d(t,x), [0 10], [0.5 0.5]);

Best Answer

  • Try to change your maxh_d function to explicitly return dxdt:
    function dxdt = maxh_d(t,x)
    dxdt = zeros(2,1); % x(1) refers to x ,x(2) refers to p
    dxdt(1)= -x(1) ; %+u
    dxdt(2)= 2*x(1)*x(2);
    end
    I've always written my ODE-functions so that they return the derivative. How you get that error-message I've no idea - since to my understanding 0 output arguments are one too few...
    HTH