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How do I comment out a large block of code in MATLAB?

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Accepted Answer

Doug Hull
Doug Hull on 18 Jan 2011
Edited: MathWorks Support Team on 8 Nov 2018
To comment out a large block of code in the Editor or Live Editor, select the code and on the "Editor" or "Live Editor" tab, click the "Comment" button. This inserts a "%" symbol in front of each selected line. Alternatively, select the code and type "Ctrl" + "R". To uncomment the selected text, click the "Uncomment" button or type "Ctrl" + "T".
You also can use the block comment operators "%{" and "%}". The "%{" and "%}" operators must appear alone on the lines that immediately precede and follow the block of help text. For example:
%{
Stuff to be commented out
%}
  5 Comments
Shapol Mohamed
Shapol Mohamed on 18 Mar 2021
In Matlab 2020, you have to use ctrl+/ (cmd+/ for mac) to comment a block and to uncomment you have to use ctrl+t (cmd+t for mac).

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More Answers (3)

CHUANQIANG ZHANG
CHUANQIANG ZHANG on 10 May 2018
Ctrl + R comment selected lines. Ctrl + T uncomment select lines.
https://stackoverflow.com/questions/30925796/is-there-a-shortcut-key-to-comment-multiple-lines-in-matlab-editor/30926004#30926004

Wesam Rezk
Wesam Rezk on 30 Mar 2018
Simply start with *... and write whatever you want. This will enable you to write a very long comment line
For example *... This is a very very long comment

Wick
Wick on 1 May 2018
Edited: Wick on 1 May 2018
Rather than comment large sections of code, I bypass them with the following syntax.
for dont_go_here = []
% code I want to skip including all nested comments, etc. can stay here unmolested
end
This assumes that your if, for, case, try, and switch commands within that block are all terminated properly with an 'end' Otherwise the script won't parse.

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