how i use slider rang in GUI?

hi

i need a help in GUI

i use slider rang to select period to diplay at axies , but the value not changed

where N4 is signal that load from file.

function SelectDataPeriodSliderValueChanging(app, event)

global N4

value = app.SelectDataPeriodSlider.Value;

segment= N4(value*200:(value*200)+999);

time_seg=0:1/200:5-(1/200);

plot(time_seg,segment,'Parent',app.UIAxes)

end

[yasmeen hadadd]

200 is the sampling freqency

[Cris LaPierre]

This can happen depending on the stepsize of your slider and the frequency of your signal.

As coded, the x axis will always be 0-5.

Consider sharing your signal file (attach using the paperclip icon) and slider settings (Limits and Step values)

Answer 1

[Abhishek]

Hi @yasmeen hadadd

In your code, you are using the 'ValueChangingFcn' callback but accessing the slider value using 'app.SelectDataPeriodSlider.Value'. As per the official documentation, the correct way to access the current slider value in 'ValueChangingFcn' is through the 'event' object passed to the callback, using the ‘event.Value’.

In App Designer, the argument is called ‘event’. You can query the object properties using dot notation. For example, ‘event.Value’ returns the current value of the slider.

Replace this line in you code:

value = app.SelectDataPeriodSlider.Value;  

with this:

value = event.Value;

This ensures that your plot responds in real time as the slider is dragged.

You can refer to the official documentation of MATLAB:

• ‘uislider’: https://www.mathworks.com/help/matlab/ref/uislider.html
• ‘ValueChangingFcn’ callback: https://www.mathworks.com/help/matlab/ref/matlab.ui.control.slider-properties.html#bucrwtv-1-ValueChangingFcn

This MATLAB Answer will help you when to select ‘ValueChangedFcn’ and ‘ValueChangingFcn’: https://www.mathworks.com/matlabcentral/answers/458098-difference-between-valuechangedfcn-valuechangingfcn#answer_371994

[yasmeen hadadd]

Thank you for your help

[Abhishek]

Hi @yasmeen hadadd, if it helps, could you accept the answer.