MATLAB Answers

GUI to plot excel with a next and previous button

1 view (last 30 days)
chlor thanks
chlor thanks on 25 Jul 2016
Commented: Geoff Hayes on 27 Jul 2016
I am a newbie working on a simple GUI that has three components:
  • axes to show the plot (tag: plotty)
  • next button (tag: NextButton)
  • previous button (tag: PreviousButton)
What I want to do is to make the GUI load data from each excel files and make the plot to display in axes. When user presses the next button, the plot will be updated with the data from the next available excel.
I made some changes to my code according to the comments and it is now working. Thank you Geoff!

Accepted Answer

Geoff Hayes
Geoff Hayes on 26 Jul 2016
chlor - if, in your OpeningFcn you define local variables as you have done as
function next_previous_in_plotty_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
guidata(hObject, handles);
filelist = {'1.xls', '2.xls', '3.xls', '4.xls'}
i = 1;
k = length(filelist);
then filelist, i, and k will only be visible within this function and be available for the duration of this function call (since not persistent and this function is only ever called once). If you want this data to be available to other callbacks, then you need to save it to the handles structure as
function next_previous_in_plotty_OpeningFcn(hObject, eventdata, handles, varargin)
handles.output = hObject;
handles.filelist = {'1.xls', '2.xls', '3.xls', '4.xls'}
handles.i = 1;
handles.k = length(file list);
guidata(hObject, handles);
Order is important in the above - we create new fields in the handles struct and then save it using guidata. (Note that you may want to consider renaming the i and k variables to something that gives an idea as to what they represent.)
And you should be able to declare your function wherever you want in the m file. Typically, I do this before I use (or call) the function.
  4 Comments

Sign in to comment.

More Answers (0)

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by