A call to warning appears to use sprintf to generate the warning message. Because you can call warning in numerous ways (with or without the warning tag, with or without a format specifier), sometimes Code Analyzer mistakenly produces this message when you use sprintf to generate the warning tag or as an argument to the warning format specifier.

Remove the sprintf call and pass the arguments directly to the warning function. For example, replace code such as this:

warning('prog:Nneg', sprintf('Input N=%d must be positive\n',N));

With this code:

warning('progr:Nneg', 'Input N=%d must be positive\n',N);

Note that MATLAB converts special characters (such as \n, \t, %s, and %d) in the warning message only when you specify more than one input argument with warning.

If Code Analyzer produced this message erroneously, you can suppress it, as described in Adjust Code Analyzer Message Indicators and Messages.