Matlab Error, Non-existent field, axes properties.

Question

randy 2012-1-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26118-matlab-error-non-existent-field-axes-properties

hello,...

i've got some home work n' i'm working with 2 axes (axes1, axes2), 2 push button (browse1, browse2) made by guide... when i push the button, i want to put an image to each axes (browse1 for axes1, browse2 for axes2) i've done it but i got some error

here's my code:

% --- Executes on button press in browse1.
function browse1_Callback(hObject, eventdata, handles)
[FileName,PathName] = uigetfile('*.jpg;*.png;*.tiff;','Select file');
if(FileName~=0)
axes(handles.axes1) 
handles.gambar=imread(fullfile(PathName, FileName));
      image(handles.gambar)
      axis off
  else
      return
  end
  guidata(hObject, handles);
% --- Executes on button press in browse2.
function browse2_Callback(hObject, eventdata, handles)
[FileName,PathName] = uigetfile('*.jpg;*.png;*.tiff;','Select file');
if (FileName~=0
axes(handles.axes2)
   handles.gambar=imread(fullfile(PathName, FileName));
      image(handles.gambar)
      axis off
  else
      return
  end
  guidata(hObject, handles);

and the generated error:

??? Reference to non-existent field 'axes2'.
error in line 107 => axes(handles.axes2)

i thought, it's because handles cannot read existence of axes2, i have checked it in property insp. but i still don't know what is the problem.... is there some properties of axes2 i missed??

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Answer 1

Chandra Kurniawan 2012-1-14

1
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https://ww2.mathworks.cn/matlabcentral/answers/26118-matlab-error-non-existent-field-axes-properties#answer_34136

在 MATLAB Online 中打开

Hi,

in the pushbutton1 callback you should write :

function browse1_Callback(hObject, eventdata, handles)
handles.output = hObject;
[FileName,PathName] = uigetfile('*.jpg;*.png;*.tiff;','Select file');
if(FileName~=0)
    axes(handles.axes1) 
    handles.gambar=imread(fullfile(PathName, FileName));
    image(handles.gambar)
    axis off
else
    return
end
guidata(hObject, handles);

in the pushbutton2 callback you should write :

function browse2_Callback(hObject, eventdata, handles)
handles.output = hObject;
[FileName,PathName] = uigetfile('*.jpg;*.png;*.tiff;','Select file');
if (FileName~=0)
    axes(handles.axes2)
    handles.gambar=imread(fullfile(PathName, FileName));
    image(handles.gambar)
    axis off
else
    return
end
guidata(hObject, handles);

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randy 2012-1-14

Dear Mr. Chandra..

thanks for help.. yes.. i've checked the tag.. and from my first GUI, tag for axes2 is always missing when i reopen it, i think that's why axes2 will never exist.. and in the second GUI, it's works... thank you very much...

randy.

Chandra Kurniawan 2012-1-14

Yes,

glad to help you.

sama-sama, mas..

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Answer 2

Jan 2012-1-14

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26118-matlab-error-non-existent-field-axes-properties#answer_34124

在 MATLAB Online 中打开

Obviously axes2 is not a field of handles. Most likely you've created the button's callback before the axes2-object. Then updating the handles dynamically would be a solution:

% --- Executes on button press in browse2.
function browse2_Callback(hObject, eventdata, handles)
[FileName,PathName] = uigetfile('*.jpg;*.png;*.tiff;','Select file');
handles = guidata(hObject);  % Update
if ischar(FileName)          % Better than FileName~=0 !
  axes(handles.axes2)
  ...

"if FileName~=0" works, but is not smart: Internally this is equivalent to:

if all(FileName ~= char(0)) & ~isempty(FileName)

So better use "ischar(FileName)" or "isequal(FileName, 0)".

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Walter Roberson 2012-1-14

It appears that randy is using GUIDE. The callbacks generated by GUIDE automatically fetch the most-recently-updated version of guidata, so Jan's guidata() solution would not be expected to help.

We have not seen enough code to know that axes2 really exists.

randy 2012-1-14

Dear Mr. Jan

i have rechecked my GUI and i thought it's weird because the "tag" for axis2 always missing when i reopen the GUI. so i created new one using Your method and Mr. Chandra's and both of it worked so good... thank you very much for help...

..oh.. and for Mr. Walter, i'm sorry for not paying attention to my answer so it's make you re edit it. thank you

Randy

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