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I get Error: Invalid expression. Check for missing or extra characters. when commenting out lines in a multi-line statement

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Bill Tubbs
Bill Tubbs on 25 Aug 2020
Commented: Bill Tubbs on 25 Aug 2020
It seems you can't comment-out entire lines in MATLAB within a multi-line statement. Or am I doing it wrong.
A few examples below.
1. Expressions
y = ...
1 + ...
2 + ...
3
Returns:
y =
6
y = ...
1 + ...
%2 + ...
3
Raises:
%2 + ...
Error: Invalid expression. Check for missing or extra characters.
2. Structure definitions
s = struct(...
'A',1,...
'B',2,...
'C',3....
)
Returns:
s =
struct with fields:
A: 1
B: 2
C: 3
struct(...
'A',1,...
% 'B',2,...
'C',3...
)
Raises:
% 'B',2,...
Error: Invalid expression. When calling a function or indexing a variable, use parentheses. Otherwise, check for mismatched
delimiters.
Even if I use the Comment tool () in the MATLAB editor it causes these errors.
This is such a basic task! What am I doing wrong?

Answers (2)

madhan ravi
madhan ravi on 25 Aug 2020
You're right.

Bill Tubbs
Bill Tubbs on 25 Aug 2020
Here is one solution but it's hardly very convenient and contrary to commenting-out in other languages:
y = ...
1 + ...
...%2 + ...
3
Returns:
y =
4
s = struct(...
'A',1,...
...% 'B',2,...
'C',3....
)
Returns:
s =
struct with fields:
A: 1
C: 3
  2 Comments
Bill Tubbs
Bill Tubbs on 25 Aug 2020
This is the best solution I think. Don't use '%' at all, just precede any lines you want to comment out with '...'.

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