problem with IF ELSE in push button GUI

hi

i'm trying to creat a gui. i'm stuck in a push button

function dft_pushbutton2_Callback(hObject, eventdata, handles)

    if handles.current_data==handles.JEEP
          filename='jeep1.wav';
    else filename='bmwsuv1.wav';
    end
    [x sr1] = wavread(filename); 
    J = fft(x(1:1024));
    f1 = linspace(0, sr1, length(J));
    plot(f1(1:end/2+1), abs(J(1:end/2+1)))

what is wrong here ??? i'm not getting it..help

the problem is the else part doesn't work. if i swap only one works. i've a pop up menu with BMW and JEEP.push button for plotting signal works but push button for dft plotting doesn't.

[Akshaya]

now i changed a bit but still it takes the value of jeep alone and performs fft .. pls suggest something...

if strcmpi(handles.current_data,'BMW')==0
    filename='jeep1.wav';
elseif strcmpi(handles.current_data,'BMW')==1
    filename='bmwsuv1.wav';
end
[x sr1] = wavread(filename); 
J = fft(x(1:1024));
f1 = linspace(0, sr1, length(J));
plot(f1(1:end/2+1), abs(J(1:end/2+1)))
guidata(hObject, handles);

it uses the value of jeep to perform fft for bmw. so i get same graph for both the choices.

[Image Analyst]

You have

handles.current_data=handles.BMW;

and you had:

handles.BMW=b;

which means handles.BMW and handles.current_data are both numerical arrays. So how could handles.current_data ever equal a string 'BMW'? One's a double array, and ones a character array.

[Walter Roberson]

And also the code has two statements,

handles.current_data=handles.BMW;
handles.current_data=handles.JEEP;

so handles.current_data would be overwritten after being set to BMW

Answer 1

[Image Analyst]

What are handles.current_data, and handles.JEEP? Are those integer values you assigned? floating point numbers you assigned? strings you assigned? or tag properties of controls in your GUI? It matters. If they're strings you need to compare with strcmpi(). If they're numbers (even handles), we need to know how they were assigned.

[Akshaya]

thank you .... ho i'm totally new to gui ... the program without the gui works fine. this is what i declared in open func.

[b sr1] = wavread('bmwsuv1.wav');
handles.BMW=b;
[j sr1] = wavread('jeep1.wav');
handles.JEEP=j;
handles.current_data=handles.BMW;
handles.current_data=handles.JEEP;
% Choose default command line output for Car_gui
handles.output = hObject;

% Update handles structure
guidata(hObject, handles);

i don't know how to use compare