MATLAB: Does a commented out line generate an error

comment

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.

Best Answer

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' ...
                };
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