loading file using uigetfile

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NUR KHAIRUNNISA rahimi
移动：Voss 2025-4-16
I wrote a few lines of codes to open a file containing a list of words, but it doesn't seem to open any file when I choose the file from the dialogue box. Can anybody tell what did I do wrong somewhere? I dont think the 'return' code was the problem because when i set it into comment, the error still existed.
[FILENAME, pathname] = uigetfile('*.wsb', 'rt');
if (isequal(FILENAME,0) || isequal(pathname,0))
disp('User pressed cancel');
else
disp(['User selected', fullfile(pathname, FILENAME)]);
end
fid = fopen(FILENAME,'rt');
if fid<0
%error could not find the file
return,
end
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sangeetha
sangeetha 2025-4-16
移动：Voss 2025-4-16
error in this line
Walter Roberson
Walter Roberson 2025-4-16
移动：Voss 2025-4-16
The first output from uigetfile is just the file name itself, without any directory information. If the file might not be in the current directory then you need something more like
[filename, pathname] = uigetfile('*.*','SELECT INPUT DATA');
S1 = load(fullfile(pathname, filename));
After that, the proper steps will depend upon the kind of file that was loaded. load() of an arbitrary file
  • might well fail, if the file is not one of a few very specific formats
  • might result in a numeric array
  • might result in a struct() with one field for each variable name loaded, if it was a .mat file
The cases that result in a numeric array are almost always better handled by readmatrix(). The cases that deal with .mat files need to reference the variable name that the data is stored in. The cases of a .mat file that has a single variable name stored in it can be handled with a small bit of code.

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Walter Roberson
Walter Roberson 2011-11-20
You need to fopen fullfile(pathname, FILENAME) rather than just FILENAME, except in the case where the chosen file just happens to be in the current directory.
I notice that you provide 'rt' as the second argument to uigetfile(). Does 'rt' happen to be what you want to prompt the user with? Not out of the question, of course, but that would be unusual: the 'rt' suggests confusion with the 'rt' argument that would need to be provided to the fopen() function [which you have done].
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Fangjun Jiang
Fangjun Jiang 2011-11-20
uigetfile() just brings up a GUI for you to pick a file. Take a look at the help of uigetfile. [FILENAME, pathname] = uigetfile('*.wsb') is sufficient for you to choose from all the .wsb files. If you add the 'w+' as you did, the 'w+' would appear in the title bar in the GUI window that was brought up. It is meaningless and has nothing to do whether you want to write or read the file.
NUR KHAIRUNNISA rahimi
NUR KHAIRUNNISA rahimi 2011-11-20
thank you, i think i got it now.

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