[R] Generate strings from multiple variables

[Bert Gunter]

...

as in:

outer(paste("A",A,sep=""),paste("B".B,sep=""), FUN =paste,sep="_")

-- Bert

On Fri, May 4, 2012 at 7:59 AM, Bert Gunter <bgunter at gene.com> wrote:
> ?outer
>
> Bert
>
> Sent from my iPhone -- please excuse typos.
>
> On May 4, 2012, at 6:25 AM, "R. Michael Weylandt" <michael.weylandt at gmail.com> wrote:
>
>> do.call(function(x,y) paste0("A",x,"_","B",y),expand.grid(x = A,y = B))
>>
>> seems to be a place to start. Robust generalization seems a hair
>> tricky -- I'll mull on it.
>>
>> Michael
>>
>> On Fri, May 4, 2012 at 9:10 AM, Johannes Radinger <JRadinger at gmx.at> wrote:
>>> Hi,
>>>
>>> it is easiest to explain what I want to do by an example:
>>>
>>> lets assume there are two factors/variables:
>>> A <- c(1,2,3)
>>> B <- c(1,3,3)
>>>
>>> Now I would like to generate a list of strings that should look like
>>> ("A1_B1","A1_B2","A2_B1","A2_B2"). So actually the string
>>> contains all possible combinations of A and B (separated by _). This should
>>> be also possible for more variables. Is there simple way
>>> to that? I thought about looping over A and B (nested for-loop)
>>> but maybe there is a straight foward solution to get such strings.
>>>
>>> /johannes
>>>
>>>
>>> --
>>>
>>> Jetzt informieren: http://mobile.1und1.de/?ac=OM.PW.PW003K20328T7073a
>>>
>>> ______________________________________________
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>>> and provide commented, minimal, self-contained, reproducible code.
>>
>> ______________________________________________
>> 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.



-- 

Bert Gunter
Genentech Nonclinical Biostatistics

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