how to set a default value for the slider?

Hi, I use slider for thresholding the image.

I used text box to get the values of both the sliders. The default value for slider("high") is 255. The problem I am facing is when I don't move the slider("high") I am unable to get the value. But when I vary the slider, I could get the value in the text box.

Can you help me in how to assign a default value in the text box even if i do not move the slider("high").

I tried in many ways, but none of them are working.

 if length(level2)==255
    level2=255;
else 
    level2=level2;
end

also I tried with

 if (nargin==255) || isempty(level2)
    level2=255;
else 
    level2=level2;
end

Any help is appreciated

thanks...

Answer 1

[Geoff Hayes]

If your default value for the slider is 255, then why not just set this value in the text box. You could do this in the opening function of your GUID (assuming that you are using GUIDE).

Suppose that slider1 is the name of the slider, text1 is the name of the text box, and myGui is the name of the GUI. Then

 function myGui_OpeningFcn(hObject, eventdata, handles, varargin)

 % Choose default command line output for myGui
 handles.output = hObject;

 % Update handles structure
 guidata(hObject, handles);

 % get the default value for the slider
 defVal = get(handles.slider1,'Value');

 % set this value in the text box
 set(handles.text1,'String',num2str(defVal));

Try the above and see what happens!