Deleting the last displayed line (or part of it) in the command window.

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Mohamed Abdalmoaty
Mohamed Abdalmoaty on 1 Feb 2017
Edited: Amin Kassab-Bachi on 18 Aug 2021
I'm trying to use the same line in the command window of Matlab to print the progress of my code.
I have read several solutions and currently I'm using the following command:
disp([repmat(char(8), 1, num_of_Char_to_del)])
This works fine on my Matlab (9.1.0.441655 (R2016b)) when running on Windows 7.
For example when I have the following code
disp('Hello World')
pause
disp([repmat(char(8), 1, 6)])
in an m file with the name 'test.m', and I run the file, first I get
>> test
Hello World
then pressing any key I get
>> test
Hello
>>
Which is what I want.
However, trying the same exact thing on a Matlab (8.5.0.197613 (R2015a) ) running on Linux server, first I get
>> test
Hello World
and if I press any key I get
>> test
Hello World
>>
which is not what I expect.
Can anyone explain what is the issue?
  2 Comments
Mohamed Abdalmoaty
Mohamed Abdalmoaty on 1 Feb 2017
Thanks for your comment. Yes, I have tried fprintf but I could not make it work.
I tried to run your code (on the version running on linux server) and it is not doing what we expect. First I get
>> test
Hello World
but when I press any key I get
>> test
Hello World
>>

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Answers (3)

Piotr
Piotr on 15 Oct 2019
Hello,
here is simple sollution, small upgrade of Jan's answer, without checking the length of the line that you want to clear:
lineLength = fprintf('It is %2.1f degrees outside',21.1);
pause(2)
fprintf(repmat('\b',1,lineLength))
Cheers,
Piotr

Jan
Jan on 1 Feb 2017
Try it without the line break:
fprintf('Hello World');
pause
fprintf(repmat('\b', 1, 6));
How did you open Matlab on the server? Through a text terminal or with the GUI?
  4 Comments
sambhav jain
sambhav jain on 30 Apr 2020
hello
i have been running matlab online . In my case it simply prints in next line . the backspace one is not working

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Amin Kassab-Bachi
Amin Kassab-Bachi on 18 Aug 2021
Edited: Amin Kassab-Bachi on 18 Aug 2021
If you're trying this from within the command line
msg=fprintf("Anything I want to write\n");
pause
fprintf(repmat('\b', 1, (msg+39))); % covers the length of the message + length of the backspace command.
Otherwise, the answers above should work.

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