R help - Aug 2009 - How to convert a string passed as an argument to a vector?

Hi,

$ cat commandArgs.R
args=commandArgs(trailingOnly=TRUE)
args[1]+10

I have the above code. But the following command line gives me an error. I
am wondering what is the correct way to convert a string to a vector?

$ Rscript commandArgs.R 1:3
> args=commandArgs(trailingOnly=TRUE)
> args[1]+10
Error in args[1] + 10 : non-numeric argument to binary operator
Execution halted


Regards,
Peng

	[[alternative HTML version deleted]]

If you have it as a character string, then you have to evaluate it:
> x <- '1:3'
> x + 10
Error in x + 10 : non-numeric argument to binary operator
No suitable frames for recover()
> eval(parse(text=x))+10
[1] 11 12 13
>

On Fri, Aug 28, 2009 at 11:04 AM, Peng Yu<pengyu.ut at gmail.com>
wrote:
> Hi,
>
> $ cat commandArgs.R
> args=commandArgs(trailingOnly=TRUE)
> args[1]+10
>
> I have the above code. But the following command line gives me an error. I
> am wondering what is the correct way to convert a string to a vector?
>
> $ Rscript commandArgs.R 1:3
>> args=commandArgs(trailingOnly=TRUE)
>> args[1]+10
> Error in args[1] + 10 : non-numeric argument to binary operator
> Execution halted
>
>
> Regards,
> Peng
>
> ? ? ? ?[[alternative HTML version deleted]]
>
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-- 
Jim Holtman
Cincinnati, OH
+1 513 646 9390

What is the problem that you are trying to solve?