[R] Smart detection of wrap width?

Paul Domaskis paul.domaskis at gmail.com
Sat Apr 18 01:36:11 CEST 2015

Yes, I found the width option in the help pages, but I was wondering
if there was automatic setting of the wrapping according to the
current window width.

Your function works exactly as I wished.  I'll probably get smarter
with time (I hope) but would it be reasonably good practice to stick
this into ~/.Rprofile?  I don't suppose there is a way to have it
automatically invoked when the window size/positition changes?  (It's
still priceless even without automatic triggering).

On Fri, Apr 17, 2015 at 7:20 PM, MacQueen, Don <macqueen1 at llnl.gov>
> A lot of this depends on what context you are running R in, e.g.,
> Windows console, Mac console, or command line in a unix-alike. Or
> within ESS in emacs. Those are different interfaces supported by, to
> some extent, different people, and are based on the underlying
> capabilities provided by the operating system.
> Have you yet encountered
>   options()$width
> ?
> For example,
>   options(width=100)
> will cause wrapping at 100, at least for certain kinds of output.
> In an xterm shell running in an X windows context, I frequently use
> setwid <- function ()
> {
>     if (!interactive())
>         return(invisible(NULL))
>     scon <- pipe("stty -a")
>     stty <- scan(scon, what = "", sep = ";", quiet = T)
>     close(scon)
>     cstr <- stty[grep("columns", stty)]
>     options(width = as.numeric(gsub("[^0-9]", "", cstr, ignore.case = T)))
>     paste("width =", options()$width, "\n")
> }
> A function I wrote that resets the width option to match the window
> widths, and therefore adjusts the wrapping after I resize a windwo.

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