[R] execute array of functions

[David Winsemius]

On Feb 14, 2012, at 2:23 PM, Nordlund, Dan (DSHS/RDA) wrote:

>> -----Original Message-----
>> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
>> project.org] On Behalf Of Muhammad Rahiz
>> Sent: Tuesday, February 14, 2012 11:03 AM
>> To: x.r-help
>> Subject: [R] execute array of functions
>>
>> Hi all,
>>
>> I'm trying to get the min and max of a sequence of number using a  
>> loop
>> like the folllowing. Can anyone point me to why it doesn't work.
>>
>> Thanks.
>>
>> type 	<- c("min","max")
>> n 	<- 1:10
>> for (a in 1:2) 	  {
>> print(type[a](n)) }

 > n=1:10
 > for (a in c(min,max)) 	  {
+ print(a(n)) }
[1] 1
[1] 10

 > funs <- c(min,max)
 > for (a in funs) 	  {
+ print(a(n)) }
[1] 1
[1] 10


>>
>>
>> --
>> Muhammad
>>
>
> I am not sure why you are trying to use this approach in a loop, but  
> you need to use the get() function if you want to do this.
>
> type <- c("min","max")
> n <- 1:10
> for (a in 1:2) 	  {
>  print(get(type[a])(n))
> }
>
> But, why not use min and max on n directly?
>
>
> Hope this is helpful,
>
> Dan
>
> Daniel J. Nordlund
> Washington State Department of Social and Health Services
> Planning, Performance, and Accountability
> Research and Data Analysis Division
> Olympia, WA 98504-5204
>
>
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David Winsemius, MD
West Hartford, CT