[R] alternative to stop()?

[Robert Gentleman]

On Wed, May 17, 2000 at 11:37:21AM -0700, Griffith Feeney wrote:
> I'm using stop to exit functions when certain arguments are specified and 
> would like to suppress the "Error in ..." that is printed to the console 
> before the message given as the argument to stop(). Is there some 
> alternative to stop that will allow this?
> 

  There are a variety of ways to do this,
 from the options help:

     error: an expression governing the handling of non-catastrophic
          errors such as those generated by `stop' as well as by
          signals and internally detected errors. The default
          expression is `NULL': see `stop' for the behaviour in that
          case. The function `dump.frames' provides one alternative
          that allows post-mortem debugging.

show.error.messages: a logical. Should error messages be printed? 
          Intended for use with `try' or a user-installed error
          handler.

    warn: sets the handling of warning messages.  If `warn' is negative

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