To create a dropdown menu in MATLAB, you can use the "uicontrol" function with the 'popupmenu' style. For example:
% Create a figure and an axis
f = figure;
ax = axes;
% Create a dropdown menu
popup = uicontrol(f, 'Style', 'popupmenu',...
'String', {'Option 1', 'Option 2', 'Option 3'},...
'Position', [20 340 100 50],...
'Callback', u/popup_callback);
% Create a second dropdown menu
popup2 = uicontrol(f, 'Style', 'popupmenu',...
'String', {'Option A', 'Option B', 'Option C'},...
'Position', [20 280 100 50],...
'Callback', u/popup2_callback);
This will create two dropdown menus with the specified options in the 'String' property. The 'Position' property determines the location and size of the dropdown menu on the figure.
To specify the options for the second dropdown menu based on the selection in the first dropdown, you can use the 'Callback' property to define a callback function that updates the options in the second dropdown menu. For example:\
% Callback function for the first dropdown menu
function popup_callback(src, ~)
% Get the index of the selected option
idx = src.Value;
% Set the options for the second dropdown menu based on the selection
% in the first dropdown menu
if idx == 1
popup2.String = {'Option X', 'Option Y', 'Option Z'};
elseif idx == 2
popup2.String = {'Option P', 'Option Q', 'Option R'};
elseif idx == 3
popup2.String = {'Option M', 'Option N', 'Option O'};
end
end
% Callback function for the second dropdown menu
function popup2_callback(src, ~)
% Do something with the selected option in the second dropdown menu
val = src.Value;
disp(['Selected: ' src.String{val}]);
end
This code defines two callback functions, one for each dropdown menu. The callback function for the first dropdown menu updates the options in the second dropdown menu based on the selection in the first dropdown. The callback function for the second dropdown menu displays the selected option in the command window.
You can then test the dropdown menus by selecting different options and observing the output.