problem with IF ELSE in push button GUI

2013 1 24
1 个回答
6 次查看（30 天）

1 个投票

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.

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Akshaya
Akshaya 2013-1-24
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
Image Analyst 2013-1-25
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
Walter Roberson 2013-1-25
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

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回答（1 个）

Image Analyst
Image Analyst 2013-1-24

0 个投票

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.

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Akshaya
Akshaya 2013-1-24
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

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Akshaya
Akshaya
2013-1-24

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