'Error using axes' when I use functions in GUI

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Peter Dauksch 2018-4-5

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/392821-error-using-axes-when-i-use-functions-in-gui

评论： Peter Dauksch 2018-4-6

I want the plot to be in axes1 of my GUI, but instead, a new figure opnes. This is only the case when I use an own function inside the GUI. This is my Code: (without Inputs)

if true
  % code
...
x = linspace(0,L,n);      % Knotenvektor
[S, M] = systemmatrizes(x, E, I, mu);
bc = [1, 1, a; 1, 2, b; n, 3, 0; n, 4, 2]; 
[Me, Se, r] = linearsystem(x, M, S, q, bc, m);
y = Se\r; 
wa = y(1:2:2*n);
axes(handles.axes1);
plot(x,wa)
axis([0 1.1*L -1 1],'square');
end

And this is the Error:

_Error using axes Invalid axes handle

Error in BalkenbiegungGUI>togglebutton1_Callback (line 266) axes(handles.axes1);

Error in gui_mainfcn (line 95) feval(varargin{:});

Error in BalkenbiegungGUI (line 42) gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)BalkenbiegungGUI('togglebutton1_Callback',hObject,eventdata,guidata(hObject)) Error while evaluating DestroyedObject Callback.__

Line 266 is axes(handles.axes1); If I don't use my functions systemmatrices and linearsystem, it works. But I need them. What am I doing wrong?

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Peter Dauksch 2018-4-6

在 MATLAB Online 中打开

Hello, thank you for the answers. I will keep trying

 if true
    % code
function togglebutton1_Callback(hObject, eventdata, handles)
% hObject    handle to togglebutton1 (see GCBO)
% handles    structure with handles and user data (see GUIDATA)
% Hint: get(hObject,'Value') returns toggle state of togglebutton1)
% Eingabeparameter aus der GUI
L = str2double(get(handles.laenge,'string'));
n = str2double(get(handles.knoten,'string'));
E = str2double(get(handles.emodul,'string'));
I = str2double(get(handles.flaechentraegheitsmoment,'string'));
mu = str2double(get(handles.massendichte,'string'));
nT = str2double(get(handles.zeitschritte,'string'));
m = get(handles.quadraturordnung, 'value');
x = linspace(0,L,n);      % Knotenvektor
a=0;
b=0;
q=@(x)0;
[S, M] = systemmatrizes(x, E, I, mu);
bc = [1, 1, a; 1, 2, b; n, 3, 0; n, 4, 2]; 
[Me, Se, r] = linearsystem(x, M, S, q, bc, m);
y = Se\r; 
wa = y(1:2:2*n);
axes(handles.axes1);
plot(x,wa)
axis([0 1.1*L -1 1],'square');
  end

this is the entire code till now. its not finished, there comes a lot more, but I want to solve this problem before I go on. If i use plot(handles.axes1, x, wa) the error changes to "Error using plot Invalid handle."

Adam 2018-4-6

在 MATLAB Online 中打开

Unless you have done some really bad things in other functions of your GUI or have corrupted your .fig file you should never have a deleted axes in a GUIDE GUI (unless you deliberately delete it which would be a bizarre thing to do usually!).

Check you don't have things like

clear all

or other sledgehammer type functions in your GUI file.

Peter Dauksch 2018-4-6