MATLAB Answers


Using a slider to move a cosine curve from the range of 1 to 100? - Homework

Asked by Nora
on 1 Dec 2013
Latest activity Commented on by Image Analyst
on 3 Dec 2013

I am writing a GUI program where a slider has a range from 1 to 100, with default value of 50 at the beginning. The plot will show a cosine curve with x-values from 0 to the value set by the slider.

This is what I have so far. I am not sure what is wrong because I can't get the slider to work???

function varargout = cosscale1(varargin)
    gui_Singleton = 1;
    gui_State = struct('gui_Name',       mfilename, ...
                       'gui_Singleton',  gui_Singleton, ...
                       'gui_OpeningFcn', @cosscale_OpeningFcn, ...
                       'gui_OutputFcn',  @cosscale_OutputFcn, ...
                       'gui_LayoutFcn',  [] , ...
                       'gui_Callback',   []);
    if nargin && ischar(varargin{1})
        gui_State.gui_Callback = str2func(varargin{1});
    if nargout
        [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
        gui_mainfcn(gui_State, varargin{:});
    % End initialization code - DO NOT EDIT
    % --- Executes just before cosscale is made visible.
    function cosscale_OpeningFcn(hObject, eventdata, handles, varargin)
    handles.output = hObject;
    set(handles.slider1, 'min', 1, 'max', 100, 'value', 50);
    %set the corresponding plotting range
    % Update handles structure
    guidata(hObject, handles);
    % UIWAIT makes cosscale wait for user response (see UIRESUME)
    % uiwait(handles.figure1);
    fplot('cos', [0, 10]);
    % --- Outputs from this function are returned to the command line.
    function varargout = cosscale_OutputFcn(hObject, eventdata, handles) 
    varargout{1} = handles.output;
    function edit1_Callback(hObject, eventdata, handles)
    myplot(hObject, handles);
    % --- Executes on slider movement.
    function slider1_Callback(hObject, eventdata, handles)
     of slider
    handles.range=get(handles.slider1, 'Value');
    %plot the curve
    myplot(hObject, handles);
    guidata(hObject, handles);
    % --- Executes during object creation, after setting all properties.
    function slider1_CreateFcn(hObject, eventdata, handles)
    if isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
        set(hObject,'BackgroundColor',[.9 .9 .9]);
    %---the actual plotting functioin
    function myplot(hObject, handles)
    str=get(handles.edit1, 'String');
    y = fh(x);
    plot(x, y, 'Parent', handles.axes1, 'Color',;




No products are associated with this question.

1 Answer

Answer by Image Analyst
on 1 Dec 2013
 Accepted answer

What happens when you set breakpoints and step through it with the debugger?


This would be so much easier if you would attach your files, so we can fix them and reattach them.

on 3 Dec 2013

I fixed the problem. Thank you.

So did I, in the answer to your duplicate question. I attach here again.

Join the 15-year community celebration.

Play games and win prizes!

Learn more
Discover MakerZone

MATLAB and Simulink resources for Arduino, LEGO, and Raspberry Pi

Learn more

Discover what MATLAB® can do for your career.

Opportunities for recent engineering grads.

Apply Today

MATLAB Academy

New to MATLAB?

Learn MATLAB today!