The %...% operators are not a panacea. they have the same precedence as `*` and `/` (I think) so you get things like:
> x %<-% 10 - 8 # %<-% has higher precedence than - [1] 2 > x # not what you thought it would be [1] 10 > x %<-% 10 ^3 # but lower than ^ [1] 1000 > x # this is what you expected [1] 1000 It isn't that hard to write a package with your own parser in it. Just have it generate the call tree from your input text and call eval() on it. Bill Dunlap Spotfire, TIBCO Software wdunlap tibco.com > -----Original Message----- > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] On Behalf Of John Fox > Sent: Wednesday, March 30, 2011 4:34 PM > To: 'Carl Witthoft' > Cc: r-help@r-project.org > Subject: Re: [R] how about a "<p-" operator? > > Dear Carl, > > I think that the following does what you want: > > > `%<-%` <- function(e1, e2){ > + e1 <- deparse(substitute(e1)) > + env <- parent.frame() > + assign(e1, e2, envir=env) > + e2 > + } > > > x %<-% 10 > [1] 10 > > > x > [1] 10 > > But, as has been pointed out, it's probably easier just to > parenthesize the > usual assignment command. > > Regards, > John > > -------------------------------- > John Fox > Senator William McMaster > Professor of Social Statistics > Department of Sociology > McMaster University > Hamilton, Ontario, Canada > http://socserv.mcmaster.ca/jfox > > > > > > -----Original Message----- > > From: r-help-boun...@r-project.org > [mailto:r-help-boun...@r-project.org] > > On Behalf Of Carl Witthoft > > Sent: March-30-11 7:00 PM > > To: r-help@r-project.org > > Subject: [R] how about a "<p-" operator? > > > > I was cursing Matlab again today (what else is new) because > the default > > action for every Matlab command is to spew the result to > the console, and > > one must remember to put that darn ";" at the end of every line. > > > > So I just wondered: was there ever a discussion as to > providing some > > modified version of the "<-" and "->" operators in R to do > the reverse? > > That is, since R does not print the values of a command > to the console, > > what if there were an operator such that > > > > > > newobject <p- somefunction() > > > > would do the same as > > > > print(newobject <- somefunction()) > > > > > > Any thoughts? > > Carl > > > > ______________________________________________ > > R-help@r-project.org mailing list > > https://stat.ethz.ch/mailman/listinfo/r-help > > PLEASE do read the posting guide http://www.R-project.org/posting- > > guide.html > > and provide commented, minimal, self-contained, reproducible code. > > ______________________________________________ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide > http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
