convert popupmenu's selected string to number form

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pammy
pammy 2013-6-29
i've popupmenu having entries as
2
4
8
16
32
64
128
i want when user selects '2' , this string value convert to 2 as number so that i can use it in variable and i can use it in my mathematical calculations.
i tried following code....
str = get(handles.popupmenu3,'String');
val = get(handles.popupmenu3,'Value');
switch str{val};
case '2'
a = get(handles.popupmenu3,'String');
a1 = str2num(a);
b = get(handles.popupmenu3,'String');
b1 = str2num(b);
case '4'
a = get(handles.popupmenu3,'String');
a1 = str2num(a);
b = get(handles.popupmenu3,'String');
b1 = str2num(b);
case '8'
a = get(handles.popupmenu3,'String');
a1 = str2num(a);
b = get(handles.popupmenu3,'String');
b1= str2num(b);
case '16'
a = get(handles.popupmenu3,'String');
a1 = str2num(a);
b = get(handles.popupmenu3,'String');
b1 = str2num(b);
case '32'
a = get(handles.popupmenu3,'String');
a1 = str2num(a);
b = get(handles.popupmenu3,'String');
b1 = str2num(b);
end
same for other cases like 64 and 128...
when i run this i got the error:
Error using str2num (line 33)
Requires string or character array input.
plz help me in correcting my error...

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采纳的回答

Walter Roberson
Walter Roberson 2013-6-29
You don't need the switch and cases. Just use
a1 = str2double(str{val});
b1 = a1;

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