R help - Jun 2006 - How to use a for loop to generate two sequences

Hi R users,

Hope the question is not too simple:

How to use a for loop to generate two lists as below:

testlist <- list(test1, test2, ..., test1000)
stringlist <-
list("test1","test2",...,"test1000")

Thanks
Xiaohua

On Thu, 29 Jun 2006, Xiaohua Dai wrote:
> Hi R users,
>
> Hope the question is not too simple:
>
> How to use a for loop to generate two lists as below:
>
> testlist <- list(test1, test2, ..., test1000)
> stringlist <-
list("test1","test2",...,"test1000")
I don't know why you would want to use a for loop:

  stringlist<-as.list(paste("test",1:1000,sep=""))
  testlist<-lapply(stringlist, as.name)


 	-thomas

A vector of character strings:

  nm <- paste("test", 1:1000, sep = "")

A list whose components are the objects: test1, test2, ...

  lapply(nm, get)

or if you do it this way the list will have 'test1', 'test2',
... as the
component names:

  L <- sapply(paste("test", 1:1000, sep = ""), get,
simplify = FALSE)

and then

  names(L)

gives the vector of names.


Also note that

  apropos("^test[0-9]+")

will give a vector of object names corresponding to objects
 in the current workspace whose names
are "test" followed by a number.

On 6/29/06, Xiaohua Dai <ecoinformatics at gmail.com>
wrote:
> Hi R users,
>
> Hope the question is not too simple:
>
> How to use a for loop to generate two lists as below:
>
> testlist <- list(test1, test2, ..., test1000)
> stringlist <-
list("test1","test2",...,"test1000")
>
> Thanks
> Xiaohua
>
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