New to Matlab and GUI - load and plot data from txt data file

I have a txt data file,i have made it B matrix of 2 columns and i want this file to load in gui(push button) and then plot these 2 columns (push button 2) how i do this? i managed to load file on gui with following code

[filename, pathname] = uigetfile({'*.txt'},'Open Directory');
if isequal(filename,0) || isequal(pathname,0)
  return

[Geoff Hayes]

George - you will need to post more of your code. Is the above being called from within a callback of your GUI? How are you getting the B matrix of two columns? Please clarify.

[Joseph Cheng]

Your code snippet doesn't load in any file. Here uigetfile just gets the folder and file name you've selected. You'll need to use either dlmread(), csvread(), fopen(), etc. to actually read in the data.

You can read up on those functions and determine whats the one that is best suited for your text file. After you've figured out how to import the file into a variable. I'd suggest looking at the sample guide template "GUI with Axes and Menu" (specifically the pushbutton1 callback).