How do I overwrite text in the command window?
显示 更早的评论
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?
采纳的回答
Walter Roberson
2017-7-10
1 个投票
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.)
更多回答（4 个）
Eeshan Bhatt
2018-10-25
编辑：Eeshan Bhatt
2018-10-25
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 个评论
Ted Shultz
2019-7-19
编辑：Ted Shultz
2019-7-19
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
2020-7-28
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.
Cristi Savlovschi
2021-7-15
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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