Question

I’ve been at this for 3 hours — so I need help.

I have a button on MATLAB’s GUI GUIDE to load a text file to store 2
columns of data as x and y.

So x = [12, 12, 23];

textfile A is:

  12 23
  12 32
  23 32

The code that is in the GUI GUIDE is under the pushbutton load_file as follows:

filename = uigetfile('*.txt')
loaddata = fullfile(pathname,filename)
load(loaddata)
A = filename(:,1)
B = filename(:,2)
handles.input1 = A;
handles.input2 = B;
axes(handles.axes1)
plot(handles.input1,handles,imput2)

Answer 1

load will load a text file, but it won’t assign the contents to anything unless you explicitly specify an output.

%# load xy data from file
xy = load(loaddata,'-ascii')
%# assign columns to A and B, respectively
%# (why not x,y)?
A = xy(:,1)
B = xy(:,2)

The -ascii option of load is not necessary, but guarantees that the file is loaded as text, and will help you remember later that the data is supposed to be a text file.