Gui loading a .mat file

Hi everyone. My question is that, what should i put under a callback function of a pop up menu for example, when I want to load a .mat file. So that .mat file will be loaded to the workspace. Also if i will click to another case of that menu, what code should I use to clear up that workspace in matlab? Thank you very much...

[Melvin]

I hope someone will answer my question...Thank you again...

Answer 1

[Image Analyst]

Here's a snippet for you:

% Have user browse for a file, from a specified "starting folder."
% For convenience in browsing, set a starting folder from which to browse.
startingFolder = 'C:\Program Files\MATLAB';
if ~exist(startingFolder, 'dir')
  % If that folder doesn't exist, just start in the current folder.
  startingFolder = pwd;
end
% 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)

storedStructure = load(fullFileName);

Each function has its own workspace. Clicking on another menu item will clear the old function's workspace - no need to have any code in there to do that. In fact, you have to do special things if you want the other function2 to see function1's workspace. See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_can_I_share_data_between_callback_functions_in_my_GUI.3F

[Melvin]

Thank you.I have another question. How can I plot in xy plane that .mat file? for example, that .mat file contains x and y variables with same size like n by 1 each?

[Image Analyst]

You mean like this

x = storedStructure.x;

y = storedStructure.y;

plot(x, y, 'rs-', 'LineWidth', 2);

[Melvin]

yeah...thank you very much...

Answer 2

[ali hamadi]

Hi everyone ,

i am new in MATLAB , and i have done my project in it and now i need to create a GUI for my project.

using the GUI , i should be able to have the following things : in my project i have 2 different channels with their results. ( AWGN , BEC )

in each channel for example : AWGN , i have different SNR from 0.5 till 3.5.

in each value of the SNR , i have different code length values like : ( 8,16,32,64,128,256,512,1024,2048)

for each code length i have stored results .MAT file , in that file i need to extract a variable called indeces(order of numbers) , and then do some calculation ( show the first 10% , 20% , 30% ...100% of that variable indeces in a txt.file.

so the main idea is : select the channel type , select the SNR values , select the CODE LENGTH , choose the percentage , after that show the results in a .txt file so how to link all the above options together with the right results file. your help is appreciated and helpful...

Regards