load ('db'); Ftrain=db(:,1:2); Ctrain=db(:,3); for(i=1:size(Ftrain,1)) dist(i,:)=sum(abs(Ftrain(i,:)-Ftest)): end try to retrieve results from db but it shows "Error while evaluating UIcontrol Callback"

why do i receive error while evaluating UIcontrol Callback?

Voss 2023-1-21

Please share the complete error message.

NUR AINA BATRISYIA 2023-1-21

Voss 2023-1-21

Please copy and paste all the red text from the command window.

NUR AINA BATRISYIA 2023-1-21

Unrecognized function or variable 'im'.

Error in TestImage>btn_recog_Callback (line 116)

Ftest=FeatureStatistical(im);

Error in gui_mainfcn (line 95)

feval(varargin{:});

Error in TestImage (line 42)

gui_mainfcn(gui_State, varargin{:});

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

Error while evaluating UIControl Callback.

Voss 2023-1-21

在 MATLAB Online 中打开

Thank you. The error says that the variable "im" has not been defined before you try to use it here:

Ftest=FeatureStatistical(im);

Please share the complete code for the function btn_recog_Callback.

NUR AINA BATRISYIA 2023-1-21

% --- Executes on button press in btn_recog.

function btn_recog_Callback(hObject, eventdata, handles)

% hObject handle to btn_recog (see GCBO)

% eventdata reserved - to be defined in a future version of MATLAB

% handles structure with handles and user data (see GUIDATA)

%% Find the class the test image belongs

Ftest=FeatureStatistical(im);

%% Compare with the feature of training image in the database

db=db.mat;

load db;

Ftrain=db(:,1:2);

Ctrain=db(:,3);

for (i=1:size(Ftrain,1))

dist(i,:)=sum(abs(Ftrain(i,:)-Ftest));

end

m=find(dist==min(dist),1);

det_class=Ctrain(m);

if det_class == 13

R1 = 'qboissieri';

set(handles.txt_outName,'string',R1);

elseif det_class == 18

R2 = 'qfrainetto';

set(handles.txt_outName,'string',R2);

elseif det_class == 17

R3 = 'qellipsoidalis';

set(handles.txt_outName,'string',R3);

elseif det_class == 22

R4 = 'qilex';

set(handles.txt_outName,'string',R4);

end

guidata(hObject,handles);

Voss 2023-1-21

If "im" is defined in another function, you have to do something to make it accessible in this function, e.g., put it in the handles structure.

https://www.mathworks.com/matlabcentral/answers/476115-guide-pass-a-variable-between-two-functions-using-handles

Jan 2023-1-22

在 MATLAB Online 中打开

This looks strange:

db=db.mat;
load db;

In the first line, db.mat extracts the field 'mat' of the struct called 'db'. The line

load db

is equivalent to the functional form:

load('db')

which adds '.mat' automatically. This might work by accident in your case. Most likely you mean:

db = 'db.mat';
load(db);

This looks similar, but has important differences.

After

Ftest=FeatureStatistical(im);

failed, because im is not a defined variable inside the current function, the line

db=db.mat;

will fail, because db is not a known variable also.

why do i receive error while evaluating UIcontrol Callback?

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