R help - Oct 2010 - Combining the values of two variables into one

I start with:

v1<-c(1,3,5,7)
v2<-c(2,4,6,8)

And I want to end up with:

v3<-c(12,34,56,78)

How do I get there?

Thanks,


David S. Herzberg, Ph.D.
Vice President, Research and Development
Western Psychological Services
12031 Wilshire Blvd.
Los Angeles, CA 90025-1251
Phone: (310)478-2061 x144
FAX: (310)478-7838
email: davidh@wpspublish.com



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On Oct 22, 2010, at 4:00 PM, David Herzberg wrote:
> I start with:
> 
> v1<-c(1,3,5,7)
> v2<-c(2,4,6,8)
> 
> And I want to end up with:
> 
> v3<-c(12,34,56,78)
> 
> How do I get there?
> 
> Thanks,
> v1*10 + v2
[1] 12 34 56 78


HTH,

Marc Schwartz

On Oct 22, 2010, at 4:14 PM, Marc Schwartz wrote:
> On Oct 22, 2010, at 4:00 PM, David Herzberg wrote:
> 
>> I start with:
>> 
>> v1<-c(1,3,5,7)
>> v2<-c(2,4,6,8)
>> 
>> And I want to end up with:
>> 
>> v3<-c(12,34,56,78)
>> 
>> How do I get there?
>> 
>> Thanks,
> 
> 
>> v1*10 + v2
> [1] 12 34 56 78
> 

David,

It occurs to me that my solution may not be correct, depending upon what your
real source data are.

For example:

v1 <- c(12, 34)

v2 <- (56, 78)
> v1*10 + v2
[1] 176 418

Does not of course get you:

  c(1256, 3478)

If that is what you actually want in that scenario, use:
> as.numeric(paste(v1, v2, sep = ""))
[1] 1256 3478

That also works for your original data:

v1<-c(1,3,5,7)
v2<-c(2,4,6,8)
> as.numeric(paste(v1, v2, sep = ""))
[1] 12 34 56 78


See ?paste, which returns a character vector, which you then coerce to numeric.

HTH,

Marc