[R] check whether connection can be opened

Michael Weylandt michael.weylandt at gmail.com
Wed Jul 18 16:18:48 CEST 2012

I think you'll need to roll your own using tryCatch() around open(). 


On Jul 18, 2012, at 5:09 AM, Berry Boessenkool <berryboessenkool at hotmail.com> wrote:

> Hi all,
> I'm working on a function that reads online data that is only available to certain IPs. It then writes a subset of the data into a file.
> So whenever I'm logged in elsewhere or am not connected to the internet, I get an error, and the function is terminated.
> I want it to rather print a message into the file.
> Is there any way to test whether a connection can be opened?
> Analogous to isOpen something like canOpen...
> Or would I want to look into the error handling options?
> By the way, the data is the internet volume used so far, which I want to track regularly (on every R-Start via Rprofile).
> My brother (a computer schientist in progress) did not know a solution, so I set out to try this with R - which I got to work fine (except the above mentioned). 
> "R beats java", I told him, to which he responded nothing ;-)
> Isn't it amazing, what one can do with R?
> Thanks ahead,
> Berry Boessenkool
>    [[alternative HTML version deleted]]
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