Re: [R] "displayed" output of cat(..., stderr()) is garbaged

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From: ripley@stats.ox.ac.uk
Date: Sat 15 Jun 2002 - 16:57:32 EST 

Message-id: <Pine.LNX.4.31.0206150755280.23922-100000@gannet.stats>

On Fri, 14 Jun 2002, Vadim Ogranovich wrote:

> Dear R-users,
>
> To display progress of a loop I wanted to print the current value of the
> loop variable, e.g.
>
> > for (i in 1:2) cat("i=", i, "\n")
> for (i in 1:2) cat(i, "\n")
> i= 1
> i= 2
>
>
> So far so good. Now I want to redirect it to stderr() (to make it
> unbuffered)
>
> > for (i in 1:2) cat("i=", i, "\n", stderr())
> for (i in 1:2) cat("i=", i, "\n", stderr())
> i= 1
> 2i= 2
> 2>
>
> This is contaminated with the value of the stderr file descriptor (2).
>
> Is there any way to get rid of this "garbage"? Is there any other way to
> write to stderr?

Use it as documented:

cat("i=", i, "\n", file=stderr()) 

-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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