Load and plot data from txt file

2013 6 4
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Good afternoon everyone,
I'm doing a research project where I have to create a GUI that allows you to open a .txt file and plot its contents. Here is my code so far:
%Opens file
[filename, pathname] = uigetfile('*.txt');
file = fullfile(pathname,filename);
S = load(file);
newfilename = (S(1:end-4));
x = newfilename(:,1);
y = newfilename(:,2);
plot(x,y);
For now I only have it specifically open the first 2 columns of data for convenience. This returns an empty plot. What am I doing wrong?

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