Load Button GUI trouble

I am using GUIDE, but I cannot reconcile how to get the push button "Load Data" to bring a "browse" window up. How to do it with using this code as a start?

      % --- Executes on button press in pushbutton1.
      function pushbutton1_Callback(hObject, eventdata, handles)
      % hObject    handle to pushbutton1 (see GCBO)
      % eventdata  reserved - to be defined in a future version of MATLAB
      % handles    structure with handles and user data (see GUIDATA)

Answer 1

[Evan]

help uigetfile

Put uigetfile in the callback of your pushbutton (the code you copy+pasted here). For info on how to specify outputs, limit your search to certain filetypes/directories, etc., read the help page for uigetfile.

[James Hendren]

is there another similar command where you can attach the data to a graph in the gui?

[Evan]

It would take a few steps to do that:

1. Create a set of axes using GUIDE
2. Open the file whose path you found using uigetfile; which function you will use will depend on the file extension: if it's a .mat file, you might use open, if it's an excel file, you might use xlsread, if its a text file, you might use textscan, etc.
3. Get the data into a form where you can plot it (this will all be based on how the data is arranged when you open it).
4. Plot the data by specifying the name of the axes you want it to be displayed on; this is done through the "tag" property of your axes. The call might be something like this:

   plot(handles.axes1,x,y,)

All of this would go in the callback of the pushbutton.

[James Hendren]

here's what I am trying to do. My gui has two graphs side by side and I am trying to load data on both graphs. The text file has 3 columns. The 1st is wavelength. Then the second is a psi value and the third is a delta. The first column would be the x-axis for both graphs. Then the the second column would be the first graph's y axis, and the third column would be the second graphs y axis. So could you offer some code to assist with this please?

[Evan]

Assuming your text file is three simply columns divided by spaces and nothing else (e.g. no text to remove), the following code should be a good starting point to help you load it in:

[filename,pathname] = uigetfile('*.txt')
fullpath = fullfile(pathname,filename);
fid = fopen(fullpath);
t = textscan(fid,'%d %d %d');

That will load in your data as a 1x3 cell array. Each cell will be a column. All you have to do then is access each cell and plot the data on your axes.