[R] passing a vector of variable names to the ... pairlist function argument

[Uwe Ligges]

On 21.04.2011 17:14, Jessica Myers wrote:
> Thanks - your last suggestion does seem to work with the ridge function,
> but the names of the objects get lost in the process. Is there a way to
> keep the object names with get?


Oh, come on, you can do that yourself:

L <- lapply(xs, get)
names(L) <- xs
do.call("cbind", L)


Uwe Ligges

> Thanks,
> Jessica Myers
>
> On Apr 21, 2011, at 11:00 AM, Uwe Ligges wrote:
>
>>
>>
>> On 21.04.2011 16:03, Jessica Myers wrote:
>>> Hi,
>>>
>>> I have a character vector that contains the names of several objects
>>> that I would like to pass to a function (specifically, the ridge
>>> function in the survival package, but cbind is a similar example). I've
>>> been struggling with how to do this so that the object values get
>>> interpreted by the function, rather than the object names.
>>>
>>> For example,
>>> x1 <- 1:4
>>> x2 <- 2:5
>>> x3 <- 3:6
>>> xs <- c("x1", "x2", "x3")
>>>
>>> If I wanted to cbind(x1, x2, x3) without typing this out, how would I do
>>> it?
>>
>>
>> For the cbind case, I'd omit cbind and ask R to:
>>
>> sapply(xs, get)
>>
>> or
>>
>> apply(matrix(xs), 1, get)
>>
>> or with cbind():
>>
>> do.call("cbind", lapply(xs, get))
>>
>> the latter can be generalized for other function calls, of course.
>>
>> Best,
>> Uwe Ligges
>>
>>
>>
>>
>>> Thanks very much!
>>>
>>> Jessica Myers
>>> Instructor in Medicine
>>> Division of Pharmacoepidemiology
>>> Brigham and Women's Hospital
>>>
>>>
>>>
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>>>
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>
>
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