[R] Output and history

Peter Dalgaard BSA p.dalgaard at biostat.ku.dk
Wed Jul 17 10:30:49 CEST 2002

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)).
> (History)
> 2) Is there a way to selectively recall a previously typed command
> based on the first characters of the command?
> I am thinking of something similar to this: if one types 'pl' at the
> prompt and then preses the up arrow key, only the commands starting
> with 'pl' will show up in the command line.

On Unix(-alikes) with readline something like that is part of the
Ctrl-R mechanism. As far as I remember, the Windows console does not
implement this (but as Brian said: patched will be considered).

   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907
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