Text progress bar in Matlab

问题:

I've got a Matlab function that takes some time to run, and I'd like to show the user that progress is being made. Just disping the progress every 5% or so would clutter the screen too much, as the previous text would not be erased.

How can this problem be solved? There's other important information in the command window, so clearing it is out of the question.

回答1:

You can use waitbar function for that. See MATLAB Documentation on waitbar.

回答2:

Showing the progess in the Command Window is also possible (and maybe easier). I found a very simple, fast to implement solution on http://undocumentedmatlab.com/blog/command-window-text-manipulation/.

reverseStr = '';
for idx = 1 : someLargeNumber

   % Do some computation here...

   % Display the progress
   percentDone = 100 * idx / someLargeNumber;
   msg = sprintf('Percent done: %3.1f', percentDone); %Don't forget this semicolon
   fprintf([reverseStr, msg]);
   reverseStr = repmat(sprintf('\b'), 1, length(msg));
end

If you embedd this code the command line is showing (for example): "Percent done: 27.8" without entering a newline every iteration!

回答3:

check this out: http://www.mathworks.com/matlabcentral/fileexchange/3607-progressbar and http://www.mathworks.com/matlabcentral/fileexchange/26773-progress-bar

回答4:

Basically what is written by @Ergodicity is correct, just for Octave if you set the standard output to be buffered (which is default btw), you had to enable it by page_output_immediately(1); see this page for more octave doc: Terminal output

a very brief modifications on the proposed code:

reverseStr = '';
fprintf('Percent done: ');
for idx = 1 : someLargeNumber
   % Do some computation here...
   % Display the progress
   percentDone = 100 * idx / someLargeNumber;
   msg = sprintf('%3.1f', percentDone); %Don't forget this semicolon
   fprintf([reverseStr, msg]);
   reverseStr = repmat(sprintf('\b'), 1, length(msg));
end