[R] problem with graphic devices

[Erik Iverson]

> Question:
> After using graphic devices, such as pdf(), png().... in R, nothing happened.
> 
> Screen Log:
> --------------------------
>> pdf("foo.pdf")
>> plot(1:10)
>> dev.off()
> null device 
>           1

I'm guessing foo.pdf was created on your file system, in whatever directory 
getwd() returns.

>>
> --------------------------
> 
> There should automatically pop-up a screen and shows the chart, but nothing happened by using above code on my machine.
> Do I misunderstanding anything???
> I have tried the code under WINDOWS and LINUX and got the same result.

 > plot(1:10)

is probably all you need to do.  Why are you trying to create a pdf file?