On 23/11/2010 4:21 PM, Edwin Sun wrote:
Hello all,
I wrote a function with many arguments. Then I need to call it many times
with changes on some arguments only. Is there any way to write a function or
have a method to "update" it, like the relationship between lm() and
update()?
Many thanks,
Edwin Sun
------------
This is the sample code.
test<- function(y, z) {
+ x<- y +1
+ w<- z * 2
+ result<- list(x=x, w=w)
+ class(result)<- "ego"
+ return(result)
+ }
me<- test(y=3, z=4); me
$x
[1] 4
$w
[1] 8
attr(,"class")
[1] "ego"
update(me, y=5)
Error in update.default(me, y = 5) : need an object with call component
Change the result line to
result<- list(x=x, w=w, call=sys.call())
and the default update method should do what you want. If it doesn't,
you can write an update.ego method to do something differently.
Duncan Murdoch
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