Following the hints given by Benoit_11 in Use a slider in MATLAB GUI, I started adapting his code so to fit my case.
I noticed that when the vector SliderValue*(1:0.1:20).^2 is modified to SliderValue*(1:dt:20).^2, with dt = 0.1, the plot does not show anything. This is required as I want to use an expression defined by variables.
A second question: how can I manually define the axes ranges?
My code:
%function GUI_slider
% GUI Controls
dt = 0.1;
t = 0:0.1:100;
handles.figure = figure('Position', [100 100 1000 500], 'Units', 'Pixels');
handles.axes1 = axes('Units', 'Pixels', 'Position', [60, 120, 900, 300]);
handles.Slider1 = uicontrol('Style', 'slider', 'Position', [60 40 400 25], ...
'Min', min(t), 'Max', max(t), 'SliderStep', [.01 .01], ...
'Callback', @SliderCallback);
handles.Edit1 = uicontrol('Style', 'Edit', 'Position', [150 453 100 20], ...
'String', 'Click on slider');
handles.Text1 = uicontrol('Style', 'Text', 'Position', [70 450 70 20], ...
'String', 'Slider Value:');
handles.xrange = 1:dt:20; %// Use to generate dummy data to plot
guidata(handles.figure, handles); %// Update the handles structure
function SliderCallback(~,~) %// This is the slider callback, executed when you release it or press the arrows at each extremity.
handles = guidata(gcf);
SliderValue = get(handles.Slider1, 'Value');
set(handles.Edit1, 'String', num2str(SliderValue));
plot(handles.xrange, SliderValue*(1:0.1:20).^2, 'Parent', handles.axes1);
end
%end
What should I correct to have it running?
As Cris Luengo noted, if un-comment first line ( %function GUI_slider ) and last line ( %end), dt would be considered as a global variable for all sub-functions inside your main function ( GUI_slider), Therefore, dt is accessible inside the sub-function SliderCallback(~,~) and you can run the code with SliderValue*(1:dt:20).^2.
For the second question, using the function axis you can manually set axes range:
axis([x_min, x_man, y_min, y_max]);
or
set(gca, 'xlim', [x_min, x_max]);
set(gca, 'ylim', [y_min, y_max]);