[R] system() not accepting strings from cat()

baptiste auguie
Tue, 10 Mar 2009 20:09:50 -0000

try
?paste


baptiste

On 10 Mar 2009, at 20:01, ig2ar-saf1 at yahoo.co.uk wrote:

>
> Hi again R-ists,
>
> How do you construct a string that you can pass to system()?
>
> For instance. Say I do
>
>> system("echo Hello!")
> Hello!
>
> That works. Now the alternative: I need to construct the string like
> this
>
>> a <- "echo"
>> b <- "Hello!"
>> c <- "\n"
>> cat(a, b, c)
> echo Hello!
>
> Looks nice... but see what happens when I try to use it
>
>> system(cat(a, b, c))
> echo Hello!
> Error in system(command, intern) : non-empty character argument
> expected
>
> I have googled extensively in and out of r-lists but I can't find a
> solution.
>
> Can anybody help?
>
>
>
>
> ______________________________________________
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> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

_____________________________

Baptiste Augui?

School of Physics
University of Exeter
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