Matlab GUI popupmenu problem

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Huda M 2022-3-15

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评论： Geoff Hayes 2022-3-16

Hello;

I used popupmenu in Matlab GUI why it refuse to write in the output box

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Answer 1

Geoff Hayes 2022-3-15

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@Huda M - the red text in your screen shot is the error message so it is telling you what is going wrong. It would be helpful to copy and paste the full error message to this question so that anyone can get an idea of what is happening. Looking at your code though (again, copying and pasting the code is more helpful than a screen shot)

set(handles.output, 'string', 1)

it seems that you are setting the output text field string property with an integer. Try doiing

set(handles.output, 'string', '1')

instead where you set the string property with a string. Please do that for each of the four conditions.

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Huda M 2022-3-16

Error using matlab.ui.Figure/set

Unrecognized property string for class Figure.

Error in GUI4>popupmenu1_Callback (line 81)

set(handles.output,'string',val);

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in GUI4 (line 42)

gui_mainfcn(gui_State, varargin{:});

Error in matlab.graphics.internal.figfile.FigFile/read>@(hObject,eventdata)GUI4('popupmenu1_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating UIControl Callback.

Geoff Hayes 2022-3-16

在 MATLAB Online 中打开

@Huda M - I think the problem is the name of your text (edit) control. It can't be named output as that conflicts with a default line of code in the OpeningFcn of your GUI. If I create a GUIDE GUI, I see the following

% --- Executes just before untitled2 is made visible.
function untitled2_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to untitled2 (see VARARGIN)
% Choose default command line output for untitled2
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes untitled2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);

Note the line

handles.output = hObject;

which overrides your text control with the handle to the figure. And so the error message Unrecognized property string for class Figure makes sense. Just rename your text control to something else and your GUI should work fine.

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