Programming |
A message identifier is a tag that you attach to an error or warning statement that makes that error or warning uniquely recognizable by MATLAB. You can use message identifiers with error reporting to better identify the source of an error, or with warnings to control any selected subset of the warnings in your programs. See the following topics for more information on how message identifiers are used:
Identifier Format
The message identifier is a string that specifies a component and a mnemonic label for an error or warning. A simple identifier looks like this:
Some examples of message identifiers are
Both the component
and mnemonic
fields must adhere to the following syntax rules:
There is no length limitation to either field.
Component Field
The component
field of a message identifier specifies a broad category under which various errors and warnings may be generated. Common components are a particular product or toolbox name, such as MATLAB
or Control
, or perhaps the name of your company, such as TechCorp
in the example above.
You can also use this field to specify a multilevel component. The statement below has a three-level component followed by a mnemonic label:
One purpose of the component field is to enable you to guarantee the uniqueness of each identifier. Thus, while MATLAB uses the identifier MATLAB:divideByZero
for its 'Divide by zero'
warning, you could reuse the divideByZero
mnemonic by using your own unique component. For example,
Mnemonic Field
The mnemonic
field is a string normally used as a tag relating to the particular message. For example, when reporting an error resulting from the use of ambiguous syntax, a mnemonic such as ambiguousSyntax
might be appropriate.
Regenerating an Error | Using Message Identifiers with lasterr |
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