How can I use guidata to pass 2 different variables in 2 different callbacks of a GUI?

My GUI is required to-

Browse for .mat and .wav files. Store the file names in storedStructure and storedStructure1.

Use load and wavread in seperate callbacks and plot those 2 functions.

Upon loading the .wav file, I plotted it without any problems. But there are problems with the .mat file.

Here's my code:

startingFolder = 'C:\Users\Mayank\Desktop\Matlab';

% Get the name of the mat file that the user wants to use.

defaultFileName = fullfile(startingFolder, '*.mat');

[baseFileName, folder] = uigetfile(defaultFileName, 'Select a mat file');

if baseFileName == 0

  % User clicked the Cancel button.

  return;

end

fullFileName = fullfile(folder, baseFileName);

storedStructur = fullFileName;

handles.b = storedStructur;

guidata(hObject,handles);

axes(handles.Sensor);

ema = load(handles.b);

plot(ema);

The error being-

Error using plot
Not enough input arguments.

Error in Speech_Proc>pushbutton10_Callback (line 149)
plot(ema);

Error in gui_mainfcn (line 96)
        feval(varargin{:});

Error in Speech_Proc (line 42)
    gui_mainfcn(gui_State, varargin{:});

Error in
@(hObject,eventdata)Speech_Proc('pushbutton10_Callback',hObject,eventdata,guidata(hObject))

Error while evaluating uicontrol Callback

Answer 1

[Walter Roberson]

When you load() a .mat file, the result is a structure with fields named after the variables stored in the file. When you plot() you need to specify which field to plot. For example if what was stored in the .mat file was a variable named "sound_data", then you would

plot(ema.sound_data);

[Mayank Amencherla]

Well, the .mat file in question is an ema file - a spreadsheet. It just contains data in rows and columns, that's all.

[Walter Roberson]

plot(ema.ema)

this is going to plot 16 lines (because you have 16 columns)