Change How Warnings Display
You can control how warnings appear in MATLAB® by modifying two warning modes,
Display a message on how to suppress the warning.
Display a stack trace after a warning is invoked.
The verbose and backtrace modes present some limitations:
prev_statedoes not contain information about the
verbosemodes in the statement,
prev_state = warning('query','all').
A mode change affects all enabled warnings.
Enable Verbose Warnings
When you enable verbose warnings, MATLAB displays an extra line of information with each warning that tells you how to suppress it.
For example, you can turn on all warnings, disable backtrace, and enable verbose warnings:
warning on all warning off backtrace warning on verbose
Running a command that produces an error displays an extended message:
Warning: "folderthatisnotonpath" not found in path. (Type "warning off MATLAB:rmpath:DirNotFound" to suppress this warning.)
Display a Stack Trace on a Specific Warning
It can be difficult to locate the source of a warning when it is generated from code buried in several levels of function calls. When you enable the backtrace mode, MATLAB displays the file name and line number where the warning occurred. For example, you can enable backtrace and disable verbose:
warning on backtrace warning off verbose
Running a command that produces an error displays a hyperlink with a line number:
Warning: "folderthatisnotonpath" not found in path.
> In rmpath at 58
Clicking the hyperlink takes you to the location of the warning.