[R] options --- na.rm , save-on-exit

[Spencer Graves]

      I presume by "no" Uwe means that there is apparently nothing as 
simple as changing "na.rm" to TRUE in "options". 

      However, you could redefine the functions "mean" and "median" so 
the default was "na.rm=TRUE".  That's easy to do with median:  Type 
"median" at a command prompt, copy the result to a script file, modify 
it, and source it.  You could also build your own package and attach it 
in a leading position in your search path so your version of median, 
etc., got used instead of the system version.  Doing this with "mean" is 
harder, because is a generic function, which means that you would need 
to know how to modify generic functions. 

      I would not recommend this.  To take an extreme analogy, I'm 
reminded of the old joke about a state senator in the sovereign state of 
__________ (you pick it), who declared that 3.14, etc., was too hard for 
school children to learn, and it school would be easier if pi were 3.  
He therefore introduced legislation to make pi = 3 (in his state, of 
course).  You can do that in R, just by typing "pi <- 3" at any command 
prompt.  However, it might have unintended consequences. 

      hope this helps. 
      spencer graves

Uwe Ligges wrote:

> 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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