MATLAB: Can I see the values that at the slider

guiMATLABmatlab guisliderslider valuestringstring type

Hello,

Can I see or can I get the values that at the slider ?

You can see the slider tabs and I need to see the values at the slider. For instance, the value of the top is 0.75, and I need to see 0,75 at the gui panel. Can you help me?

Thank you

Best Answer

You can access the slider value from the handle to the slider. I don't know if you're using 'guide' or 'appdesigner' (or neither) but you'll use the same method either way. Here's a demo

fig = uifigure;
h = uislider(fig);
% h is the handel to your slider
sliderValue = h.Value;

If you want to display that on your GUI you'll need to add a static text box that displays the value.

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MATLAB: Add listener in slider CreateFcn

addlistener(hObject, 'ContinuousValueChange', @(hObject, eventdata) slider1_Callback(hObject, eventdata, handles))

But be careful: it is the value of handles as of the time of the call to addlistener that will be "captured" and passed in to the slider1_Callback. Any changes you might make to handles after that call will not be reflected.

For this reason I recommend passing the figure number of the GUI instead, and then in the callback routine, using guidata() on the GUI figure to pull out the current version of the handles structure.

Exception: if you are using only a single figure (including the GUI) then I would not bother to pass handles and instead in the callback would use

handles = guidata(hObject);

to pull out the current handles structure. You can do this as long as the callback object is part of the GUI figure; if the callback object is part of some other figure then you need to know the GUI figure number (or at least the tag of something known to be part of the GUI figure.)

MATLAB: GUI: adjust axes values with 2 different sliders

Marcel - you almost have the correct code, you just need to pass a vector as the value for the Xlim parameter. Since slider1 corresponds to the minimum value for you axes limit, then just change the above code to

 function slider1_Callback(hObject, eventdata, handles)
     minVal = get(handles.slider1,'Value');
     maxVal = get(handles.slider2,'Value');
     set(handles.axes1,'Xlim',[minVal maxVal],'XTick',floor(linspace(minVal,maxVal,5)));

I've added the XTick parameter so that the x-axis ticks are linearly spaced from the minimum to the maximum value along the axis (there are 5 ticks displayed).

And this same code can be re-used for the slider2_Callback. In order to prevent code duplication, you can do something like the following

 function slider1_Callback(hObject, eventdata, handles)
     adjustAxisLimits(handles);
 function slider2_Callback(hObject, eventdata, handles)
     adjustAxisLimits(handles);
 function adjustAxisLimits(handles)
     minVal = get(handles.slider1,'Value');
     maxVal = get(handles.slider2,'Value');
     set(handles.axes1,'Xlim',[minVal maxVal],'XTick',floor(linspace(minVal,maxVal,5)));

So both slider callbacks call the same function to adjust the limits.

Best Answer

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MATLAB: Add listener in slider CreateFcn

MATLAB: GUI: adjust axes values with 2 different sliders

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