I need something like the writeln in C. I need to make error messages

> Date: Mon, 24 Jun 2013 18:20:13 -0400
> Subject: Re: [R] packages for input messages
> From: sarah.goslee@gmail.com
> To: kicco1991@hotmail.it
> CC: r-help@r-project.org
> 
> It sounds like ?stop is what you're looking for.
> 
> Sarah
> 
> On Mon, Jun 24, 2013 at 4:50 PM, Francesco Miranda <kicco1991@hotmail.it> wrote:
> > Hello,I was trying to enter commands input messages or error within a routin.for example :  msg (consistency error: at the time ( j : generic time ) the lower quantile is not less than the upper quantile)
> > thanks in advanceFrancesco Miranda
> 
> -- 
> Sarah Goslee
> http://www.functionaldiversity.org
 		 	   		  
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