R help - Jul 2004 - options --- na.rm , save-on-exit

dear R wizzards:  two options() related questions.

[a] options(na.action):  many of my variables have missing variables, 
so I would like to set a default to ignore, especially in univariate 
functions like mean() and median() .  alas, without na.rm=T in the 
functions themselves, I always get an NA.  my code is full of na.rm=T 
is there a magic invokation of options with na.action that is honored 
by these functions?

[b] options(?): how do I get R to not prompt me for saving the 
workspace upon exit, but to instead automatically save the command 
history .Rhistory but not the data .RData ?

help appreciated.

sincerely,

/iaw
---
ivo welch
professor of finance and economics
brown / nber / yale

ivo_welch-rstat8783 at mailblocks.com wrote:
> 
> dear R wizzards:  two options() related questions.
> 
> [a] options(na.action):  many of my variables have missing variables, so 
> I would like to set a default to ignore, especially in univariate 
> functions like mean() and median() .  alas, without na.rm=T in the 
> functions themselves, I always get an NA.  my code is full of na.rm=T is 
> there a magic invokation of options with na.action that is honored by 
> these functions?
No.

> [b] options(?): how do I get R to not prompt me for saving the workspace 
> upon exit, but to instead automatically save the command history 
> .Rhistory but not the data .RData ?
you can define a function like:

Q <- function (save = "no", status = 0, runLast = TRUE){
   savehistory()
   .Internal(quit(save, status, runLast))
}

and call Q(), if you want to exit.

Uwe Ligges


> help appreciated.
> 
> sincerely,
> 
> /iaw
> ---
> ivo welch
> professor of finance and economics
> brown / nber / yale
> 
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On Sat, 3 Jul 2004 ivo_welch-rstat8783 at mailblocks.com wrote:
> [b] options(?): how do I get R to not prompt me for saving the 
> workspace upon exit, but to instead automatically save the command 
> history .Rhistory but not the data .RData ?
The first is in the appendix to An Introduction to R: --no-save etc.

For the second, see ?savehistory and especially its example.

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595