Handling Slider in GUI

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JA
JA 2016-8-18
回答： Andres Castillo Bermudez 2018-11-28
I want my slider to increase in steps of 1, no fractions allowed, not when it's being dragged. Not even when i click on increase/decrease button.
function slider2_Callback(hObject, eventdata, handles)
% hObject handle to slider2 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
% Hints: get(hObject,'Value') returns position of slider
% get(hObject,'Min') and get(hObject,'Max') to determine range of slider
set(handles.slider2, 'Max',10);
set(handles.slider2, 'Min', 1);
set(handles.slider2, 'SliderStep' , [1,1] );
sliderValue = get(handles.slider2,'Value');
set(handles.edit2,'String',sliderValue)
even though i have it 1,1. it doesn't work according to what i want and i have kept the minimum as 1, so when i click on increase button. it increases '0.01' and i get this error:
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
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
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
and the slider disappears. Not sure where i am going wrong

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采纳的回答

Walter Roberson
Walter Roberson 2016-8-18
Setting the min and max and sliderstep should be done at the time the slider is created, such as in slider2_CreateFcn
For the other part of your question see https://www.mathworks.com/matlabcentral/answers/216723-how-can-i-force-a-slider-uicontrol-object-in-guide-to-move-in-discrete-steps
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Walter Roberson
Walter Roberson 2016-8-18
You should give it a Value in slider2_CreateFcn as the default is 0
JA
JA 2016-8-19
Thanks for your reply. Can you help me with the slider steps. I have set it as
set(hObject, 'SliderStep' , [1/9,1/9] );
In the CreateFcn, but only when i use the increase/decrease button, it works when i drag the slider. it does not work

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更多回答（1 个）

Andres Castillo Bermudez
I Round the number with the 'round function'
coff=round(get(hObject,'value')); %round the number
set(handles.lpfDisplay,'String',num2str(coff)); %display the number on a text box
I use it for a guitar effect on Matlab.

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