What is an error in the GUI?

Question

Veronika 2015-2-24

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https://ww2.mathworks.cn/matlabcentral/answers/180082-what-is-an-error-in-the-gui

评论： Stephen23 2015-3-2

采纳的回答： Stephen23

在 MATLAB Online 中打开

Dear all

I have this part of code in GUI:

function pushbutton3_Callback(hObject, eventdata, handles)
load ('testovaci_modely3')
disp('Testovací modely byly načteny.')
load ('netrb')
disp('Neuronová síť byla načtena.')
prompt = {'Napište číslo testovacího modelu:'};
dlg_title = 'Vytvoření vlastního testovacího modelu';
num_lines = 1;
z = 2;
x = inputdlg('Napište číslo testovacího modelu:','Vytvoření vlastního testovacího modelu', [1 100]);
if z>=2
disp('Zadali jste správné číslo.')
P = m{1,z};
Y = sim(net,P);
imdl =  mk_common_model('d2d1c',16);
img_1 = mk_image(imdl);
img_input = img_1;
img_2.elem_data = Y;
img_test=img_1;
img_test.elem_data=P;
figure
show_fem(img_test)
figure
show_fem(img_2)
else
disp('Zadali jste špatné číslo.')
end

The first figure(img_test) is imaged, but the second isn´t. And Comand Window reports this:

Reference to non-existent field 'type'.

Error in show_fem>proc_params (line 133) if strcmp( mdl(1).type , 'image' )

Error in show_fem (line 37) [img,mdl,opts] = proc_params( mdl, options );

Error in GUI>pushbutton3_Callback (line 142) show_fem(img_2)

Error in gui_mainfcn (line 96) feval(varargin{:});

Error in GUI (line 43) gui_mainfcn(gui_State, varargin{:});

Error in @(hObject,eventdata)GUI('pushbutton3_Callback',hObject,eventdata,guidata(hObject))

Error using drawnow Error while evaluating uicontrol Callback

Does anybody know what's wrong?

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Stephen23 2015-2-24

编辑：Stephen23 2015-2-24

show_fem is part of this toolbox:

http://eidors3d.sourceforge.net/

Veronika 2015-2-24

show_fem comes from EIDORS http://eidors3d.sourceforge.net/

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Answer 1

Stephen23 2015-2-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/180082-what-is-an-error-in-the-gui#answer_169101

编辑：Stephen23 2015-2-24

在 MATLAB Online 中打开

You call show_fem twice. Interestingly the error happens on the second call, so the first call must be fine.

A practical solution is to try and figure out why these two calls are different. Use the debugging tools to look at the variables img_test and img_2 just before they are used as arguments to show_fem. See how they are different, and maybe change whatever it is that is different to make the second call work properly.

Another solution is to review the documentation for show_fem and double-check that your input variables fulfill all of the stated prerequisites.

If you want to know why this happens, then we can read this directly from the error message:

Error in GUI>pushbutton3_Callback (line 142) show_fem(img_2)

means you call show_fem with variable img_2. Internally show_fem then calls another function called proc_params, which outputs a variable named mdl:

[img,mdl,opts] = proc_params( mdl, options )

mdl is (presumably) a structure, but the expected field type is missing, thus:

if strcmp( mdl(1).type , 'image' )

gives the error message

Reference to non-existent field 'type'.

To know why type is missing would require digging through all of that code. If you open proc_params and search for mdl.type (and similar) you might find some references to this, and get an idea of why it is not being defined.

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Veronika 2015-2-28

untitled.m

Thank you, I used debugging and I figured out where the error is. It is in size of variables, especially in elem.data. Elem.data aren´t the same. I need to variables img_1, img_2, img_test and img_input had equally large elem_data best 2959x1 double. Do you have any idea how to do it? I attached file with my code.

Stephen23 2015-3-2

Sorry but I don't use EIDORS, so I can't run your code. If you need to resize some data, then there are multiple ways to do this: including interpolation, subsampling, spline fitting, and much more. What you use depends on you and your requirements.

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