warning                 package:base                 R Documentation

Warning Messages

Description:

     Generates a warning message that corresponds to its argument(s)
     and the expression or function from which it was called.

Usage:

     warning(...)

Arguments:

     ...: character vectors (which are pasted together with no
          separator) or `NULL'.

Details:

     The result depends on the value of `options("warn")'.

     If `warn' is negative warnings are ignored; if it is zero they are
     stored and printed after the top-level function has completed; if
     it is one they are printed as they occur and if it is 2 (or
     larger) warnings are turned into errors.

     If `warn' is zero (the default), a top-level variable
     `last.warning' is created.  It contains the warnings which can be
     printed via a call to `warnings'.

See Also:

     `stop' for fatal errors, `warnings', and `options' with argument
     `warn='.

Examples:

