GUI Project Help?

In my GUI I want to display an image depending on the selection my user makes.

This is my current code for that section of the GUI:

panelSelection = get(handles.pnlND, 'SelectedObject');
disease = get(panelSelection,'String')

A = imread('Alzheimers_EEG.png');
B = imread('Dementia_EEG.png');
C = imread('BrainCancer_EEG.png');
D = imread('Epilepsy_EEG.jpg');
E = imread('Depression_EEG.png');
F = imread('Squizophrenia_EEG.png');
G = imread('BorderlinePersonalityDisorder_EEG.jpg');
H = imread('Parkinsons_EEG.jpg');
I = imread('Stroke_EEG.png');
J = imread('TIA_EEG.png');
K = imread('Normal_EEG.png');

if strcmp (disease, A)
    imshow(A)
else 
    if strcmp (disease, B)
        imshow(B)
    else
        if strcmp (disease, C)
            imshow(C)
        else
            if strcmp (disease, D)
                imshow(D)
            else
                if strcmp (disease, E)
                    imshow(E)
                else 
                    if strcmp (disease, F)
                        imshow(F)
                    else
                        if strcmp (disease, G)
                            imshow(G)
                        else
                            if strcmp (disease, H)
                                imshow(H)
                            else
                                if strcmp (disease, I)
                                    imshow(I)
                                else
                                    if strcmp (disease, J)
                                        imshow(J)
                                    else
                                        if strcmp (disease, K)
                                            imshow(K)
                                        else
                                        end
                                    end
                                end
                            end
                        end
                    end
                end
            end
        end
    end
end

The problem is, I don't know how to tell the program that if the user selects - for example - 'Stroke' in the GUI panel displayed then that equals I and I = the corresponding image - in this case I = imread('Stroke_EEG.png'). How can I specify this?

Answer 1

[DGM]

I would approach it something like this. I don't know how your figure is set up, but somewhere you should have a list of the strings you're putting in the menu/list object. Here, I'm going to presume that this is how it's defined.

Somewhere in figure setup or parameter definitions, you'd have lists associating the menu text and the corresponding filenames ...

% these are ostensibly the list of options that are in the menu
imagenamestrings = {'Alzheimers', ...
                    'Dementia', ...
                    'Brain Cancer', ...
                    'Epilepsy', ...
                    'Depression', ...
                    'Schizophrenia',...
                    'BPD', ...
                    'Parkinsons', ...
                    'Stroke', ...
                    'TIA', ...
                    'Normal'};
% this is the corresponding list of the actual filenames
imagefilenames = {'Alzheimers_EEG.png', ...
                    'Dementia_EEG.png', ...
                    'BrainCancer_EEG.png', ...
                    'Epilepsy_EEG.jpg', ...
                    'Depression_EEG.png', ...
                    'Squizophrenia_EEG.png', ...
                    'BorderlinePersonalityDisorder_EEG.jpg', ...
                    'Parkinsons_EEG.jpg', ...
                    'Stroke_EEG.png', ...
                    'TIA_EEG.png', ...
                    'Normal_EEG.png'};

Then somewhere in some callback function ...

% get the string from the object
panelSelection = get(handles.pnlND, 'SelectedObject');
disease = get(panelSelection,'String')

% look up the filename based on the menu string
thisfilename = imagefilenames{strcmpi(disease,imagenamestrings)}

% read just that one file and do something with it
A = imread(thisfilename);
imshow(A)

As Benjamin mentioned, it may be necessary to construct the full path to feed imread(). If you have a fixed path to the directory containing the image files, you can construct the full path like so:

% say that this is defined somewhere with other parameters
imagedirpath = 'path/to/images'; % something like that
% ...
% then somewhere in whatever callback does the loading
A = imread(fullfile(imagedirpath,thisfilename));

PS don't worry about the moderator bot flagging you. Considering the ubiquity of single-use spam accounts, it's critical of new users. I took care of it as soon as I saw it was you.

[Cristina Muniz]

Thank you for your help I got the program to work but it only works when I select 4 of the selections in my GUI. All the other 7 options don't let me show the image they pull up the following Error:

Unable to perform assignment with 0 elements on the right-hand side.

Error in final_project>Enter_Callback (line 128)

thisfilename = imagefilenames{strcmpi(disease,imagenamestrings)}

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in final_project (line 42)

gui_mainfcn(gui_State, varargin{:});

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

Error while evaluating UIControl Callback.

Can you help me fix this so I can select all the other ones too?

[DGM]

Apparently the values in disease aren't matching anything in the list imagenamestrings. If the menu/listbox options are being defined by imagenamestrings, then I'm not sure what the issue would be. If the menu/listbox options are being defined explicitly by something else, then that discrepancy would be a cause.

Ultimately, I can't know for sure unless I see how the figure is being set up and have a means to troubleshoot it.

[Image Analyst]

@Cristina Muniz plase attach your .fig file and .m file so we can debug this.