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Why does a commented out line generate an error

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The following code throws an error
CellArray = { ...
'X' ...
% ,'X' ...
,'X' ...
};
The error is:
Dimensions of matrices being concatenated are not consistent.
If I erase the commented out line, there is no error. So my question is: why isn't commenting out a line equivalent to erasing it.

Accepted Answer

Walter Roberson
Walter Roberson on 8 Jun 2018
Edited: Walter Roberson on 8 Jun 2018
Using ... is equivalent to bringing the next line up to the end of the current line. So that code is equivalent to
CellArray = { 'X' % ,'X' ...
,'X' };
The last last of those lines is not brought up to the previous one because the ... itself on the line before it has been commented out.
You need to use
CellArray = { ...
'X' ...
... % ,'X' ...
,'X' ...
};
Or, since ... itself acts to comment out the rest of the line,
CellArray = { ...
'X' ...
... ,'X' ...
,'X' ...
};
  2 Comments
Walter Roberson
Walter Roberson on 8 Jun 2018
It is by definition.
"Three or more periods at the end of a line continues the current command on the next line. If three or more periods occur before the end of a line, then MATLAB ignores the rest of the line and continues to the next line. This effectively makes a comment out of anything on the current line that follows the three periods."

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