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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