On 07-09-2012, at 20:00, wwreith wrote:
> I am just starting to experiment with writing a function and have run into
> what seems like a limitation or more likely a lack of understanding on my
> part.
>
> Very Simple Example: I want to define a function that does 1+1=2.
>
> z<-1
> ADD<-function(x)
> {
> x<-x+1
> }
> ADD(z)
> z
> output for z is 1 not the expected 2.
>
expected ==> "desired"
Your ADD is not returning the new value of x.
Either
ADD<-function(x)
{
x<-x+1
x # return new value of x
}
or
ADD<-function(x)
{
x<-x+1
return(x) # return new value of x
}
or even
ADD<-function(x)
{
(x<-x+1)
}
Have a look in the R-intro manual section "Writing your own functions"
Berend
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