Dot indexing is not supported for variables of this type when trying to write value into static text box

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Samuel Leeney
Samuel Leeney 2020-10-16
回答： Image Analyst 2020-10-17
function text7_CreateFcn(hObject, eventdata, handles)
value=1;
set(handles.text7, 'String', num2str(value))
I am trying to add a value that will be determined by a slider in my GUI into the text of a static text box, but recieve the error message 'Dot indexing is not supported for variables of this type'
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Image Analyst
Image Analyst 2020-10-17
Do not put anything into the CreateFcn() functions of controls. If you want something to be initialized with a value, then put that value into the String property of the control in GUIDE, not in the CreateFcn.
Now, to get the value of a slider and put it in the text box as you move the slider, you'd put it into the callback function of the slider, not the callback of the text box.
function slider1_CallbackFcn(hObject, eventdata, handles)
value = handles.slider1.Value;
textLabel = sprintf('Slider = %.3f', value);
% Update text box
handles.text7.String = textLabel;

更多回答（2 个）

Fangjun Jiang
Fangjun Jiang 2020-10-16
编辑：Fangjun Jiang 2020-10-16
set(hObject, 'String', num2str(value))
see this comment ?
% hObject handle to edit1 (see GCBO)
% handles empty - handles not created until after all CreateFcns called
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Samuel Leeney
Samuel Leeney 2020-10-17
Like this? set(handles, 'String', num2str(value))
Thanks, I actually tried migrating this across to app designer but it didn't go across properly. I will probably use app designer in the future. We have next to no support from the professor's this year due to the pandemic so have been making quite a few basic mistakes with stuff like this!
Rik
Rik 2020-10-17
No, set(hObject,'String',num2str(value)).
Using a programmatic GUI (and not AppDesigner) offers a wide variety of benefits. I would encourage you to check out the thread I linked in my previous comment.

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Walter Roberson
Walter Roberson 2020-10-17
function text7_CreateFcn(hObject, eventdata, handles)
value = 1;
set(hObject, 'String', num2str(value))

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