[R] function that uses a variable name as the parameter

[bartjoosen]

You're almost there:


a <- 12 # starting value 

add <- function(variable,increment) { 

variable + increment 

} 


add(a,25) 

you shouldn't assign variable + increment to variable, unless you put a
return in your function:

add <- function(variable,increment) { 
variable <- variable + increment 
return(variable)
} 



Bart


David Croll wrote:
> 
> 
> 
> Hello dear R people!
> 
> 
> Several times it occurred to me that a function that uses a variable name
> as a parameter would be helpful, but I did not find out how to write such
> a function. I have experience in several programming language, but I did
> not come across a helpful trick...
> 
> What I want to have is...
> 
> a <- 12 # starting value
> 
> add <- function(variable,increment) {
> 
> variable <- variable + increment
> 
> }
> 
> # by typing a and 25 for example, you specify that 25 will be added to the
> variable a...
> 
> add(a,25)
> 
> # the new a equals 12 + 25 = 37
> 
> Thanks for all the help – I'll try to give my advice when I get across a
> problem I can solve!
> 
> 
> David
> -- 
> GMX Download-Spiele: Preizsturz! Alle Puzzle-Spiele Deluxe über 60%
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> 
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 

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