Undefined function or variable

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Shahmeer Rosli
Shahmeer Rosli 2016-5-16
评论： Shahmeer Rosli 2016-5-16
% --- Executes on button press in pushbutton4.
function pushbutton4_Callback(hObject, eventdata, handles)
% hObject handle to pushbutton4 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
global YYY bbox
getappdata(0,'bbox');
Yunus1=('Car')
Yunus2=('Bus')
Yunus3=('Motor')
Yunus4=('Truck')
Yunus5=('Unknown')
total = bwarea(bbox);
Z=total;
load ('car_1.mat');
load ('bus_1.mat');
load ('motor_1.mat');
load ('truck_1.mat');
if any(Z==car_1);
set(handles.edit_2,'String',Yunus1);
elseif any (Z== bus);
set(handles.edit_2,'String',Yunus2);
elseif any (Z== motor);
set(handles.edit_2,'String',Yunus3);
elseif any (Z== truck);
set(handles.edit_2,'String',Yunus4);
else
set(handles.edit_2,'String',Yunus5);
end
Error
Undefined function or variable 'car_1'.
Error in test_gui>pushbutton4_Callback (line 209)
if any(Z==car_1);
Error in gui_mainfcn (line 95)
feval(varargin{:});
Error in test_gui (line 42)
gui_mainfcn(gui_State, varargin{:});
Error in @(hObject,eventdata)test_gui('pushbutton4_Callback',hObject,eventdata,guidata(hObject))
Error while evaluating UIControl Callback

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回答（1 个）

Walter Roberson
Walter Roberson 2016-5-16
You would get that error if none of your .mat files defines a variable named car_1 . Remember, when you load a .mat file in that form of load, the variables that appear in the workspace are named the same thing as the variables in your .mat file, which might not be the same thing as the name of the .mat file.
You are doing equality comparisons between the computed area and some loaded values. Those will almost never be exactly equal. http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
You should be considering checking to see which of the values is closest to the computed area.

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