[R] last.warning and function problem

[Huntsinger, Reid]

Inside the function the environment doesn't contain last.warning. 
The "exists" function by default checks parent environments 
(inherits=TRUE) but wisely, "rm" doesn't (inherits=FALSE). You just
need to change the default for "rm" to get the desired behavior.

Reid Huntsinger

-----Original Message-----
From: Marta Rufino [mailto:mrufino at cmima.csic.es]
Sent: Tuesday, November 05, 2002 10:53 AM
To: r-help at stat.math.ethz.ch
Subject: [R] last.warning and function problem


Hello,

I am a newbie in R and I am trying to create a function, that includes
several functions inside.
To avoid that everything stops if there is an error, I have this statement 

bla = function(....){
...
if(exists("last.warning")){rm(last.warning)}
...
}

inside the function, which if I use it normally, it works fine, but once I
use it with the funciotn it gives me an error like:

$"remove: variable "last.warning" was not found"
NULL

which breaks my function.
I just want to make it do: if exists the file last warning, remove it, if
not, just proceed...
Does anyone knows why this happens? How can I avoid it?
Thanks in advance.
Marta 
    

><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>
`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>`·.¸¸.·´

Marta Rufino

Centre Mediterrani d'Investigacions Marines i Ambientals
(CMIMA). CSIC
Passeig Maritim 37-49
08003  BARCELONA

Tfno:34 93 230 95 40
Tfax:34 93 230 95 55

><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>
`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>`·.¸¸.·´¯`·.¸.·´¯`·...¸><((((º>`·.¸¸.·´


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