GUI + Reference to non-existent field 'axes1'.

hi all.

I'm working on a project, where i load data ind by "importdata". I want to plot some funktion from these data.

I have created a funktion that open a direction and select a file from this.

this funkion is created like this:

function handles = RoboTrainer( handles )

[filename, pathname] = ...

     uigetfile({'*dat'},'File Selector');

[Time,Position,Velocity,RoboForce,AppliedForce,Repetition] =... importfile(fullfile(pathname, filename));

%% GUI variables

handles.MyData.Time = Time;

handles.MyData.Position = Position;

handles.MyData.Velocity = Velocity;

handles.MyData.RoboForce = RoboForce;

handles.MyData.AppliedForce = AppliedForce;

handles.MyData.Repetition = Repetition;

end

I have another function that has to plot a funktion from Time and Position.

function handles = TimePosition( handles )

Sample = length( handles.MyData.Time );

tid=linspace(0,(Sample*0.05),Sample);

axes(handles.axes1);

plot(tid,handles.MyData.Position);

ylabel ('position'); xlabel ('tid/sek'); title ('Position');

end

In my GUI i have created a axes (named axes1).

function axes1_CreateFcn(hObject, eventdata, handles)

handles = RoboTrainer( handles );

guidata(hObject, handles);

handles = TimePosition( handles );

guidata(hObject, handles);

but when i run my GUI, i got this error: "Reference to non-existent field 'axes1'." i don know what I make wrongly?

is there anyone to help me please?

i did not know how to explain the problem without explain all my code :(.

Answer 1

[Geoff Hayes]

Mehdi - put a breakpoint at the first line of your axes1_CreateFcn function, then re-run your GUI. When the debugger pauses at this line, look at handles structure - it is probably an empty object and so the error message makes sense (I reproduced this with a simple GUI).

If you want to populate your axes in this manner (calling the RoboTrainer and TimePosition functions), I would just put this code in the OpeningFcn of your GUI when the handles structure has all of its widget/control (i.e. axes1) fields defined. Something like

 function MyGui_OpeningFcn(hObject, eventdata, handles, varargin)

 handles.output = hObject;

 handles = RoboTrainer(handles);

 handles = TimePosition(handles);

 guidata(hObject, handles);

Try the above and see what happens!

[mehdi]

thank you very much sir.

it works now! :)

I always thought that i call funktions in my axes_callback.

I have forgotten about OpeningFcn function.

[Geoff Hayes]

Glad that it works!