Byron Ellis wrote: > On Nov 21, 2007 10:27 AM, Simon Urbanek <[EMAIL PROTECTED]> wrote: > >> On Nov 21, 2007, at 1:11 PM, Byron Ellis wrote: >> >> >>> I actually like = because I screw myself over with things like >>> b[b<-1]=-1 on a regular basis. :-) >>> >>> Of course, I also manage to screw myself over with (b = 1 | x == 2) so >>> perhaps there's simply no hope for me... Perhaps the Smalltalk-style >>> assignment ':='.... >>> >>> >> Wasn't that ALGOL, really? ;) I must agree that I like it as well (and >> surprisingly it's still compatible with R's syntax - just in case we >> don't have enough assignment operators already) - but then, I'm one of >> those poor kids who grew up on Pascal, so I don't count ;). [Still, I >> wouldn't go as far as to re-introduce begin/end :P] >> > > I always thought it was a common mapping for the 3270's left arrow key > (I also always assumed that's where S' <- operator came from) Yes, and there was this "portable" terminal called the Execuport back in the 70s (it weighed about 30 pounds), two of whose features were thermal paper that usually self-erased when you left it on a windowsill and a key that translated the underscore character to a left-facing arrow. Rick Becker and I each had one of those terminals, so naturally ... > > when > PC-style keyboards started dominating, the same as the ^ operator in > Smalltalk is a mapping to the up arrow key on the original keyboard. I > too grew up on Pascal (Turbo Pascal 3. Imagine my disappointment in > Anders Hejlsberg and C#, though it's now finally starting to Suck > Less). >
>> Cheers, >> Simon >> >> >> >> >>> On Nov 21, 2007 8:45 AM, John Chambers <[EMAIL PROTECTED]> wrote: >>> >>>> ??? ? ???Simon Urbanek wrote:?James,?????On Nov 21, 2007, at 8:22 >>>> AM, James Milks wrote:??????> The '=' sign can be used in place >>>> of?'<-'. That's the only shorthand ?> I know for R.??> ??> ? ???? >>>> That's not a shorthand. `=` and `<-` are semantically different in? >>>> R.????Well, not really :-)????It's true that the "=" operator won't >>>> be displayed as "<-", which ?I?agree was the original point. But >>>> both assignment operators map ?into?the same internal C code, if >>>> you dig into the implementation.????The "=" operator was added in >>>> S4 to assuage folks with C/Java/awk ?....?backgrounds who didn't >>>> care for the weird assignment operator. ?But?"real" S and R >>>> users still seem to like "<-" better.????Alexy was asking >>>> presumably about shorthands that you press/type in ?the?R Mac GUI >>>> which will result in `<-` being produced and those ?are?<Alt><-> >>>> (this comes from Emacs' "_" shortcut which you?type on US ?keyboard >>>> as <Shift><-> but given that the?character _ is often used ?these >>>> days, we c! >>>> reated a variant where you?use <Alt> instead of <Shift>) ?and >>>> <Ctrl><=>?(this one is simply a play on the equal sign and should ? >>>> make sense on?other keyboards, too). The last shorthand I ? >>>> mentioned?(<Alt>+<=>) is a direct translation of the sign (which? >>>> you ?get in other programs when pressing <Alt><=>) into R?code.????? >>>> Cheers,??? >>>> Simon >>>> ?????????------------------------------------------------------------------------??_______________________________________________ >>>> ?R-SIG-Mac mailing [EMAIL >>>> PROTECTED]://stat.ethz.ch/mailman/listinfo/r-sig-mac? >>>> ??????? >>>> [[alternative HTML version deleted]] >>>> >>>> >>>> _______________________________________________ >>>> R-SIG-Mac mailing list >>>> [email protected] >>>> https://stat.ethz.ch/mailman/listinfo/r-sig-mac >>>> >>>> >>>> >>> >>> -- >>> Byron Ellis ([EMAIL PROTECTED]) >>> "Oook" -- The Librarian >>> >>> >>> >> > > > > [[alternative HTML version deleted]] _______________________________________________ R-SIG-Mac mailing list [email protected] https://stat.ethz.ch/mailman/listinfo/r-sig-mac
