Le ven 14/10/2005 Ã  00:39, Benedict P. Barszcz a Ã©crit :

> Dnia piÄ…tek, 14 paÅºdziernika 2005 00:13, Sundar Dorai-Raj napisaÅ‚:
> 
> > Don't you mean system("ls")? See ?system.
> >
> > Arguments:
> >
> > command: the system command to be invoked, as a string.
> 
> This is the kind of obstacles a newbie has to overcome.
>  Whoeve is writing the 
> documentation for R, please do not attempt to save on bytes. Life would be so 
> much more pleasureable.... if only it would say "as a quoted string". Jee.
> 

obviously, you're a newbie in informatic. In most of informatic
language, you use quoted string to  distinguish it from variable of your
environnement. if not quoted, string is interpreted like a variable

and you must declared your variable previously, otherwise, you have a
message error... like you had.

best.

Yves


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