slider callback

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mohamed khalaf
mohamed khalaf 2011-7-16
[EDIT: 201107`5 20:23 CDT - reformat - WDR]
hi all
i want to obtain the output of value a from callback function of slider
i used
h=uicontrol('Style', 'slider',...
'Min',0,'Max',1,'Value',0.01,...
'Position', [400 20 120 20],...
'Callback',{@su});
function a= su(h,event) %#ok<INUSL>
val =get(h,'Value');
a=val
end
i want the value after changing the slider position by mouse and i used:
d=su(h,'Value')
but it return the initial value of slider
thanks

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回答（2 个）

Fangjun Jiang
Fangjun Jiang 2011-7-16
No, I tried your code and it worked fine. Maybe:
1. You don't need the "end" statement
2. You need to save the function su() in a separate .m file as su.m
3. Or, add a line at the begining "function mygui" and save it as mygui.m and then run it.
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mohamed khalaf
mohamed khalaf 2011-7-17
okay no way to call the value of a in exx()?
Fangjun Jiang
Fangjun Jiang 2011-7-17
You can call it but it's pointless, right? You just set its value to be 0.01 and then call it right away to get the value. Function exx() executes only once. Once the Slider is created, the code inside exx() is not longer executed.

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Walter Roberson
Walter Roberson 2011-7-16
Seems a bit pointless.
h=uicontrol('Style', 'slider',...
'Min',0,'Max',1,'Value',0.01,...
'Position', [400 20 120 20]);
su = @() get(h,'Value');
Then, whenever you want the value, call su() -- having made sure that su is in scope for the place it is called.
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Walter Roberson
Walter Roberson 2011-7-17
The code I gave doesn't store anything. Calling su() will always give the current value of the slider. If you are not seeing the current value of the slider in your code, perhaps your code is not waiting for the slider change before it extracts the slider value.
mohamed khalaf
mohamed khalaf 2011-7-17
okay i run your code
but the same problem appear again using su()the initial value is appear
thanks

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