should the text for RIGHT_ASSIGN be -> in getParseData()?

But up-arrow, ctrl-A then "z <-" is not much less convenient, is it?

I didn't know that ctrl-A would bring me to the start of the line, nor
that ctrl-E would bring me to the end.  Thanks.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

-----Original Message-----
From: peter dalgaard [mailto:pdalgd at gmail.com]
Sent: Friday, July 05, 2013 11:25 AM
To: William Dunlap
Cc: Barry Rowlingson; R-devel
Subject: Re: [Rd] should the text for RIGHT_ASSIGN be -> in getParseData()?


On Jul 5, 2013, at 18:59 , William Dunlap wrote:

Is there any reason right-assign with "->" still exists? How much
code on CRAN uses it, and how trivially could it be excised?

I use '->' a lot when doing interactive work.  I often first run a command
to see its printed output then decide that I had better save its value.
The up-arrow key gives me the previous command line with the cursor placed at the
end of the line so adding '-> z' at the end of the line is convenient.
(Not using the up-arrow key and doing 'z <- .Last.value' also works, but
I don't like its context sensitivity.)

But up-arrow, ctrl-A then "z <-" is not much less convenient, is it?

I have used in with multi-line input, occasionally, though. As in

replicate(10000, {
  ysim <- rbinom(length(p), n, p)
  glm(cbind(ysim, n - ysim) ~ x, binomial)$deviance
})

... and then you realize that you probably don't want to look at 10000 simulated
deviances and add "-> simDev".

I never use '->' when writing code in a file, so you would have to search
my .Rhistory files, not my *.R files, for evidence of its usefulness to me.

Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com

-----Original Message-----
From: r-devel-bounces at r-project.org [mailto:r-devel-bounces at r-project.org] On

Behalf

Of Barry Rowlingson
Sent: Friday, July 05, 2013 9:29 AM
To: Duncan Murdoch
Cc: R-devel
Subject: Re: [Rd] should the text for RIGHT_ASSIGN be -> in getParseData()?

On Fri, Jul 5, 2013 at 12:57 PM, Duncan Murdoch
<murdoch.duncan at gmail.com> wrote:

R itself doesn't make use of the text column, it's for display of code
by highlighters etc.  So if anyone does assume text is a function name,
it's their bug, not ours.  In fact, the bug is already there, because
there is actually one other example which was being parsed properly,
"**" is translated to "^".  There's no `**` function, but 2**3 works.

Is there any reason right-assign with "->" still exists? How much
code on CRAN uses it, and how trivially could it be excised? Can we
also have 'up assign'  and "down assign" so I can do:

  3
x -^
x -v
  4

- they make just as much sense.

Okay, lets see all the edge cases.....

Barry

--
Peter Dalgaard, Professor,
Center for Statistics, Copenhagen Business School
Solbjerg Plads 3, 2000 Frederiksberg, Denmark
Phone: (+45)38153501
Email: pd.mes at cbs.dk  Priv: PDalgd at gmail.com