Re: [R] Clearing Console- rm(list=ls(all=TRUE)) not working for me

From: Rolf Turner <rolf.turner_at_xtra.co.nz>
Date: Thu, 14 Apr 2011 18:53:22 +1200

On 14/04/11 15:21, YAddo wrote:
> Dear all again:
>
> I have been trying to clear weeks of codes in my R console, even after
> quitting and coming back another day!. One of you out there graciously
> suggested this rm(list=ls(all=TRUE)). I tried this but no dice.
>
> Codes tried.
>
> Ctrl +L , clears for the time

     Clearing the console is completely different from truncating
     your history.

> ... and the the latest i used ...
> rm(list=ls(all=TRUE))
Talk about the blind leading the blind! The person who gave you that advice really doesn't understand much if anything about R. He/she seems to have no idea about the distinction between completely distinct concepts.

The

         rm(list=ls(all=TRUE))

command removes *objects* from your workspace. It has nothing whatever to do with your history of *commands* (``codes'' as you so quaintly put it).

To get rid of past history you can simply edit your .Rhistory file and delete
all but, say the last 50 lines.

If you want to limit your history so that it never contains more than 50 lines you can do

         Sys.setenv(R_HISTSIZE=50)

This has to be done every time a new R session is started. I have a similar command in my .Rprofile so that it gets done automatically. I use R_HISTSIZE=5000
however. I don't really understand why you object to having a fairly long history
available to you.

     cheers,

         Rolf Turner



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