How do I overwrite text in the command window?
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Kyle Poe
le 10 Juil 2017
Réponse apportée : Cristi Savlovschi
le 15 Juil 2021
I am trying to write a counter that uses the format "processing subject ### of 123", where the ### changes in the command window upon every subject change. I know this could be accomplished in a loop with something like
fprintf('processing subject 000 of 123')
for number in 1:123
fprintf('\b\b\b\b\b\b\b\b\b\b%s of 123',subnum(number))
% subnum is a 3-digit number in character form to preserve the 3-digit format declared elsewhere
end
But that is ugly and terribly inefficient. How do I rectify the problem?
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Réponse acceptée
Walter Roberson
le 10 Juil 2017
That is the most efficient way. There is no way to address individual characters or pixels of the command output window (unless perhaps you can get at it from the java level.)
2 commentaires
dpb
le 10 Juil 2017
And, \r is interpreted same as \n so that doesn't help, either.
But, might consider either a waitbar or just a msgbox
Plus de réponses (4)
Eeshan Bhatt
le 25 Oct 2018
Modifié(e) : Eeshan Bhatt
le 25 Oct 2018
I know you have an accepted answer, but here's a quick robust code that I use often.
nbytes = fprintf('processing 0 of %d', length(z));
for nz = z
while nbytes > 0
fprintf('\b')
nbytes = nbytes - 1;
end
nbytes = fprintf('processing %d of %d', nz, length(z));
% YOUR PROCESS HERE
%
%
%
end
1 commentaire
Ted Shultz
le 19 Juil 2019
Modifié(e) : Ted Shultz
le 19 Juil 2019
Eeshan, this is a nice solution! I would propose this small modification so that it runs a little faster, and is a little simpler:
nbytes = fprintf('processing 0 of %d', length(z));
for nz = z
fprintf(repmat('\b',1,nbytes))
nbytes = fprintf('processing %d of %d\n', nz, length(z));
% YOUR PROCESS HERE
%
%
%
end
Boubat Matthieu
le 28 Juil 2020
I packaged the use of fprintf('\b') into a class hoping that it will ease the way to rewrite/update text in the command window. If you want to give it a try it's available here.
It goes like this:
prefix = 'processing subject ';
suffix = ' of 123';
progression = UpdatableText(prefix,suffix); % UpdatableText is the actual class
for i = 1:123
progression.print(num2str(i));
end
There are also methods to easily add a percent value and a progress bar.
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Cristi Savlovschi
le 15 Juil 2021
function dispProgressMsg(msg)
ASCII_BKSP_CHAR = 8;
persistent prevMsgLen;
if isempty(prevMsgLen)
prevMsgLen = 0;
end
disp([ char(repmat(ASCII_BKSP_CHAR,1,prevMsgLen)) msg]);
prevMsgLen = numel(msg)+1;
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