Matlab is not recognizing sections %%

I am working with Matlab 2018a and for some reason Matlab stop recognizing my sections (%%). Maybe I did something after messing in Home>Preferences, but I'm not really sure. Has anyone had this problem before? I've look online and people say "Enable Cell Mode", but I have no idea how to do this in 2018a.

thanks in advance.

[Reza Banaei]

Look for open sentences in your code. Something like

'output' ...

will break the sectioning.

Answer 1

[Steven Lord]

Look for the message indicator in your file in the Editor. See the first picture on this documentation page for the location of the message indicator. Is it red? If so your code has a syntax error that would prevent it from running successfully, and if your code is not syntactically valid I believe MATLAB will not recognize your sections. Correct the problems that Code Analyzer has identified as red (error) issues and I expect the sections should resune working.

[Blake Porter]

Hi Steven, I do not have any errors in the code and it all executes. I gave a more detailed description here: https://www.mathworks.com/matlabcentral/answers/467586-matlab-2018a-editor-no-longer-showing-code-sections

[Federico Sansalone]

I solved it simply changing the name of the script file wich was containing spaces! (From "Capacity Problem.m" to "CapacityProblem.m").

[ohad akler]

Federico answer works !

[Steven Lord]

Yes, MATLAB program file names are not allowed to contain spaces. Otherwise, consider the example Federico Sansalone posted. If you had both "Capacity Problem.m" and Capacity.m, would "Capacity Problem" call the first of those functions with no inputs or the second of those functions with the char vector 'Problem' as input?

Answer 2

[Arvind Sathyanarayanan]

Did you turn-off the sections in the Autoformatting menu?

[Blake Porter]

I have the same issue and I have both section break options ticked. Restarted Matlab and computer did not help.

[per isakson]

Is your "message indicator" green?

Answer 3

[KIDKAWHI]

welp we all stuck in this boat

[Federico Sansalone]

I solved it simply changing the name of the script file wich was containing spaces! (From "Capacity Problem.m" to "CapacityProblem.m").

[Marion Kreins]

thx, it worked :)

[per isakson]

Spaces in mfile names are not allowed. The "message indicator" of R2018b indicates the error. It's red!

However, in my simple case R2018b still recognizes the sections.

Answer 4

[Bruno Tremblay]

This is a huge limitation of matlab. For instance when we debug, we may have part of the code that still "messy", and debugging of sections using %% is not possible until we have cleaned up the entire code.