How to Change the Min property of slider?

The code below works perfectly until I change Min from 0 to 1. Why cannot I set it 1? What is the solution?

function test3()

hfig = figure();

slider = uicontrol('Parent', hfig,...
                'Style', 'Slider',...
                'Tag', 'slider1',...
                'Callback', @slider_callback,...
                'Min', 0,...
                'Max', 40,...
                'SliderStep', [1/40 10/40]);

function slider_callback(hObject, eventdata)

a = get(hObject, 'Value');

disp( a );

[Jan]

Please use the "{} Code" button to format code in the forum. I've done this for you this time.

Answer 1

[Jan]

When you set the 'Min' value to 1, the current 'Value' is still at 0. Therefore you should see the warning:

Warning: slider control can not have a Value outside of Min/Max range
Control will not be rendered until all of its parameter values are valid

Considering this:

function test4()  
hfig = figure();
slider = uicontrol('Parent', hfig,...
                'Style', 'Slider',...
                'Tag', 'slider1',...
                'Callback', @slider_callback,...
                'Min', 1, 'Max', 40,...
                'Value', 1, ...               % <- Inside [Min, Max]
                'SliderStep', [1/40 10/40]);  % Perhaps [1/39, 10/39]

function slider_callback(hObject, eventdata)
a = get(hObject, 'Value');
disp(a);

[Rightia Rollmann]

Thank you so much! Just one more question if possible: When I use GUIDE, and then want to manually adjust the code in the Editor (e.g., setting Value to 1), where is the best to put the code? Should I create a new function or just store them in ..._OpeningFcn?

[Jan]

The OpeningFcn is fine.

[Adam]

I usually factor it out into another function that I call from the _OpeningFcn, just to keep it a bit tidier, but it all amounts to the same thing.