MATLAB Programming Fundamentals - MathWorks

Change How Warnings Display

You can control how warnings appear in MATLAB by modifying two warning modes,

verbose and backtrace.

Mode Description Default

verbose Display a message on how to

suppress the warning.

off (terse)

backtrace Display a stack trace after a

warning is invoked.

on (enabled)

NoteThe verbose and backtrace modes present some limitations:

• prev_state does not contain information about the backtrace or verbose modes
  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:

rmpath('folderthatisnotonpath')

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

26 Error Handling