MATLAB: Does the slider disappear when I change the Min and Max properties

disappearMATLABmaxminslider

When I create a slider and set the Min property of the slider to 1 and the Max property to 10, my slider disappears. Why does it disappear and how do I get it to reappear?

u = uicontrol('Style', 'slider');
set(u, 'Min', 1, 'Max', 10);

Best Answer

There are two reasons why the slider can disappear when you change the Min and Max properties.

1) The Value property of the slider is no longer between the Min property and the Max property. If this is the case, change the Min, Max, and Value properties so that the Min property is less than or equal to the Value property, which is less than or equal to the Max property:

u = uicontrol('Style', 'slider');
set(u, 'Min', 1, 'Max', 10, 'Value', 1);

2) The Max property of the slider is less than or equal to the Min property of the slider. To correct this, change the Min property and/or the Max property of the slider so that the Min property is strictly less than the Max property.

Related Solutions

MATLAB: How to restrict sliders movement without modify Max and Min properties

You can make up your own range in the slider callback with myMin and myMax that is different than the min and max property of the slider:

sliderValue = get(handles.slider1, 'Value');
if sliderValue > myMax
  sliderValue = myMax;
elseif sliderValue < myMin
  sliderValue = myMin
end
% Send the value back to the slider.
set(handles.slider1, 'Value', sliderValue);
guidata(hObject, handles);

MATLAB: Increasing slider value of a GUI

See https://www.mathworks.com/help/matlab/ref/uicontrol-properties.html#property_SliderStep

figure;
uicontrol('Style', 'Slider', 'Position', [10, 10, 200,20], ...
          'SliderStep', [1/29, 0.1], ...
          'Min', 10, 'Max', 300, 'Value', 10, ...
          'Callback', 'disp(get(gcbo, ''Value''))')

The range goes from 10 to 300, which is a distance of 290. To get a stepsize of 10, the SliderStep must be 10/290, or 1/29. You should expect rounding errors, so fix the value in the callback:

uicontrol('Style', 'Slider', 'Position', [10, 10, 200,20], ...
          'SliderStep', [1/29, 0.1], ...
          'Min', 10, 'Max', 300, 'Value', 10, ...
          'Callback', mySliderCB);
function mySliderCB(SliderH, EventData)
Value = round(get(SliderH, 'Value'));
set(SliderH, 'Value', Value);
...

Best Answer

Related Solutions

MATLAB: How to restrict sliders movement without modify Max and Min properties

MATLAB: Increasing slider value of a GUI

Related Question