Note that objects can have more than one class, in which case your == and %in%
might not work as expected.
Better to use inherits().
cheers,
Steve
-----Original Message-----
From: R-help [mailto:r-help-boun...@r-project.org] On Behalf Of Steven Yen
Sent: Wednesday, 24 June 2015 11:37a
To: boB Rudis
Cc: r-help mailing list
Subject: Re: [R] Call to a function
Thanks! From this I learn the much needed class statement
if (class(wt)=="character") wt <- x[, wt]
which serves my need in a bigger project.
Steven Yen
On 6/23/2015 6:20 PM, boB Rudis wrote:
> You can do something like:
>
> aaa <- function(data, w=w) {
> if (class(w) %in% c("integer", "numeric", "double")) {
> out <- mean(w)
> } else {
> out <- mean(data[, w])
> }
> return(out)
> }
>
> (there are some typos in your function you may want to double check, too)
>
> On Tue, Jun 23, 2015 at 5:39 PM, Steven Yen <sye...@gmail.com> wrote:
>> mydata<-data.frame(matrix(1:20,ncol=2))
>> colnames(mydata) <-c("v1","v2")
>> summary(mydata)
>>
>> aaa<-function(data,w=w){
>> if(is.vector(w)){
>> out<-mean(w)
>> } else {
>> out<-mean(data[wt])
>> }
>> return(out)
>> }
>>
>> aaa(mydata,mydata$v1)
>> aaa(mydata,"v1") # want this call to work
>
--
Steven Yen
My e-mail alert:
https://youtu.be/9UwEAruhyhY?list=PLpwR3gb9OGHP1BzgVuO9iIDdogVOijCtO
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