Code Analyzer returns this message because it appears the code accesses the value of the named variable before it sets that variable. Sometimes, this message results from an error in the code logic or a typographical error. Other times, Code Analyzer generates this message incorrectly because MATLAB has functions, such as load and eval, which can set new variables in the workspace without Code Analyzer detecting it.

This message is incorrect more often than most messages. However, when it is correct, this message reveals problems that might otherwise cause obscure run-time bugs in your program.

If Code Analyzer generated this message as the result of an error in the code, fix the error. Otherwise, if Code Analyzer generated this message incorrectly, do one or more of the following:

• Give Code Analyzer (and anyone else reading the program) more information about where the variable gets set.

  For example, sometimes initializing the variable can remove the message.

• Be explicit about which variables are loaded through a load command.

• Simplify complicated program logic for the benefit of both Code Analyzer and human readers of the program.

• Suppress the message as described in Adjust Code Analyzer Message Indicators and Messages.