drop down list and function

so i made a simple guide with one of the features is the drop down list, but i find the diffilcuties by connecting the input menu from the drop down list to other function. this is my codes, so the purpose is user can choose one of this filters.

%---------------------------- F I L T E R ---------------------------------

%----------------------------- D E L T A ----------------------------------

Fs = 100;

order = 12;

f_low = 1;

f_high = 4;

[Delta] = Bandpass_Butter(f_low,f_high,Fs,order)

data_Delta = filter(Delta, Filtered_Data);

%----------------------------- T H E T A ----------------------------------

order = 12;

f_low = 4;

f_high = 8;

[Theta] = Bandpass_Butter(f_low,f_high,Fs,order)

data_Theta = filter(Theta, Filtered_Data);

%----------------------------- A L P H A ----------------------------------

order = 12;

f_low = 8;

f_high = 14;

[Alpha] = Bandpass_Butter(f_low,f_high,Fs,order)

data_Alpha = filter(Alpha, Filtered_Data);

%------------------------------ B E T A -----------------------------------

order = 12;

f_low = 14;

f_high = 30;

[Beta] = Bandpass_Butter(f_low,f_high,Fs,order)

data_Beta = filter(Beta, Filtered_Data);

%----------------------------- G A M M A ----------------------------------

order = 12;

f_low = 30;

f_high = 40;

[Gamma] = Bandpass_Butter(f_low,f_high,Fs,order)

data_Gamma = filter(Gamma, Filtered_Data);

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Answer 1

[Ram Sreekar]

Hi Indri Ristika Utami ,

I understand that you are trying to execute the function ‘Bandpass_Butter’ and ‘filter’ with different values for “f_low”, “f_high” based on the selection from dropdown.

This can be done by using the ‘switch’ statement and assigning different values to “f_low” and “f_high” based on the selection in the dropdown. You can refer to the sample code given below.

% Create a figure to hold the GUI elements
figure('Name', 'Filter Selection');

% Create a drop-down menu
filterMenu = uicontrol('Style', 'popupmenu', 'String', {'Delta', 'Theta', 'Alpha', 'Beta', 'Gamma'},...
    'Position', [200 200 100 100], 'Callback', @filterSelectionCallback);

% Define the callback function for the drop-down menu
function filterSelectionCallback(source, ~)
    % Get the selected filter from the drop-down menu
    selectedFilter = source.Value;
    
    % Define the filter parameters based on the selected option
    switch selectedFilter
        case 1 % Delta
            f_low = 1;
            f_high = 4;
        case 2 % Theta
            f_low = 4;
            f_high = 8;
        case 3 % Alpha
            f_low = 8;
            f_high = 14;
        case 4 % Beta
            f_low = 14;
            f_high = 30;
        case 5 % Gamma
            f_low = 30;
            f_high = 40;
    end
    
    % Apply the selected filter
    Fs = 100;
    order = 12;
    [filter] = Bandpass_Butter(f_low, f_high, Fs, order);
    filteredData = filter(filter, Filtered_Data);
    
    % Perform any further processing or display as needed
end

Hope this helps you resolve your query.