[R] Output and history

Liaw, Andy andy_liaw at merck.com
Wed Jul 17 14:34:34 CEST 2002

> From: Peter Dalgaard BSA [mailto:p.dalgaard at biostat.ku.dk]
> Daniel Mastropietro <mastropi at uwalumni.com> writes:
> > Hello,
> > 
> > I have the following two questions, rergarding:
> > 
> > (Output)
> > 1) Is it possible to have the output of a command automatically
> > displayed, without explicitly requesting it after the command, and
> > without using the print() function? For example, I want to see the
> > value of 'a'  when I write for instance 'a <- rep(1,10)'.
> > I tried setting the 'echo' option to TRUE but it has no 
> effect on that.
> No. "<-" creates an invisible object as its return value and they
> don't print until you "visiblify" them. One standard device is to put
> the whole thing in parentheses: (a <- rep(1,10)).

But couldn't he use the taskCallbackManager() to print .Last.value after
every evaluation at the top level?  I'd guess that sort of does what Daniel


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