"Not enought input arguments" ode45 error

Question

Annie 2015-8-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/232206-not-enought-input-arguments-ode45-error

回答： Steven Lord 2015-8-3

Hello, everyone,

I'm working on a code for a GUI in Matlab where I use a subfunction that uses ode45, the problem is that it sends me this error:

Error using Prueba_con_Bergman>f (line 292)
Not enough input arguments.
Error in odearguments (line 87)
f0 = feval(ode,t0,y0,args{:});   % ODE15I sets
args{1} to yp0.
Error in ode45 (line 113)
[neq, tspan, ntspan, next, t0, tfinal, tdir, y0,
f0, odeArgs, odeFcn, ...
Error in Prueba_con_Bergman>pushbutton1_Callback
(line 264)
        [t,x] = ode45(@f,tspan,x0);
Error in gui_mainfcn (line 95)
        feval(varargin{:});
Error in Prueba_con_Bergman (line 42)
    gui_mainfcn(gui_State, varargin{:});
Error in
@(hObject,eventdata)Prueba_con_Bergman('pushbutton1_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating uicontrol Callback

I'm saving the numbers given to the GUI into some variables, where it is also converted into double. This is the part that executes the ode 45:

function pushbutton1_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
tf= str2double(get(handles.edit6,'String'))
G0= str2double(get(handles.edit7,'String'))
X0= str2double(get(handles.edit8,'String'))
I0= str2double(get(handles.edit10,'String'))
% function innerdiabetic     
        tspan = [0; tf]; 
        x0 = [G0; X0; I0];  %Falta modificar D 
        [t,x] = ode45(@f,tspan,x0);
          axes(handles.axes2);   %Grafica glucosa
          plot(t,x(:,1));
          grid on
          axes(handles.axes3); %Grafica insulina remota
          plot(t,x(:,2));
          grid on
          axes(handles.axes4); %Grafica insulina
          plot(t,x(:,3));
          grid on
function dxdt = f(t,x,handles)
p1= str2double(get(handles.edit1,'String'))   %THIS IS LINE 292
p2= str2double(get(handles.edit2,'String'))
p3= str2double(get(handles.edit3,'String'))
n= str2double(get(handles.edit4,'String'))
Gb= str2double(get(handles.edit11,'String'))
      dxdt = [  (p1 - x(2))*x(1) - ((p1)*Gb);  %dG(t)/dt
                (p2*x(2) + p3*x(3));
                (n*x(3))    
                ];

I have no problem with the first variables, it's just until line 292 that starts the problem, I tried it with constants instead of variables and it works. What it wrong with the code?

Thanks

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Answer 1

Steven Lord 2015-8-3

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/232206-not-enought-input-arguments-ode45-error#answer_188105

You aren't passing the handles structure into your ODE function. But I would avoid doing that anyway; as written, if you DID pass the handles structure in you'd be querying the graphics objects for its property values every time the ODE solver called your function. That's going to be slow, and could allow the user to modify the problem while you're trying to solve it.

Instead I recommend retrieving the property values from the graphics objects BEFORE calling the ODE solver and passing the retrieved values in as additional parameters. The documentation for the ODE solvers includes a link to a documentation page that describes how to pass additional parameters into your ODE function.