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Matlab not stopping on some breakpoints

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Ray Harris
Ray Harris on 1 Jul 2020
Commented: Keenjhar on 3 Jan 2024
Matlab suddenly (this afternoon) stopped honoring some, but not all, of my breakpoints on a file I have been working on since this morning.
I tried reloading Matlab, but problem persisted.
I tried removing my only "clear" statement (I have no "clear all" statements) and it had no effect.
Matlab is useless fo rme until this gets fixed!!!!!
  2 Comments
Adam Danz
Adam Danz on 1 Jul 2020
Have you tried removing all break points, saving the file, closing the file, reopening the file, and setting new break points?
This has never happened to me and I use debug mode with break points on a nearly daily basis for years.
Keenjhar
Keenjhar on 3 Jan 2024
yes but still it is not working

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Answers (2)

Image Analyst
Image Analyst on 1 Jul 2020
Yes, it can happen and I see it fairly often. It's usually when I do something like set breakpoints and run then stop at a breakpoint. Then change a variable name or edit the code somehow and set new breakpoint. Then it sometimes won't stop at the new breakpoints, I think because the file needs to be saved again. If I just exit and restart, then it will see the new breakpoints and stop at them.
  3 Comments
Bogdan -Ervin
Bogdan -Ervin on 10 Oct 2023
Edited: Bogdan -Ervin on 10 Oct 2023
In my case, even though the breakpoint is valid (it has the red color and the line doesn't have any error), the code will not stop at breakpoint. This happens in Matlab R2020a.

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Gurpreet Singh
Gurpreet Singh on 1 Jul 2020
Hi Ray,
Please refer to the following Doc in MATLAB Command Window:
>>web(fullfile(docroot, 'matlab/debugging-code.html'))
You can also try to use the following command at the beginning of script:
>>dbstop if caught error
MATLAB will go to debug mode at the erroneous line, though this will probably stop more than the user wants.
You can also execute only selected code by keyboard shortcut F9.

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