[R] zoo column names

[Pete Brecknock]

Gabor Grothendieck wrote:
> 
> On Thu, May 26, 2011 at 7:35 PM, Pete Brecknock
> <Peter.Brecknock at bp.com> wrote:
>> I have a zoo object that contains 2 time series named "A-B" and "V1".
>>
>> When I create a third series "V2", the name of the "A-B" series is
>> changed
>> to "A.B".
>>
>> Although I could recreate the names for the 3 series I am wondering if
>> there
>> is a way of preventing the name change from happening  ( ... maybe an
>> equivalent of the keep.names=TRUE statement on merge.zoo)?
>>
>>
>> #------------------------------------------------
>> library(zoo)
>>
>> # Create zoo data with required col names
>> d = data.frame(c(10,20,30),c(1,2,3))
>> names(d) = c("A-B", "V1")
>> d.z = zoo(d,1:3)
>>
>> # Create new variable "V2"
>> # col name changes from "A-B" to "A.B"
>> d.z$V2 = d.z[,"V1"] *100
>>
>> # recreate col names
>> names(d.z) = c(names(d),"V2")
>> #-------------------------------------------------
>>
> 
> Its doing a merge behind the scenes and this is a side effect of that.
>  I agree that its strange behavior and will look at it.  In the
> meantime try performing an explicit merge so that you can control it
> using check.names:
> 
>> d.z <- zoo(cbind(`A-B` = c(10, 20, 30), V1 = c(1, 2, 3)))
>> merge(d.z, V2 = 100*d.z$V1, check.names = FALSE)
>   A-B V1  V2
> 1  10  1 100
> 2  20  2 200
> 3  30  3 300
> 
> 
> 
> 
> -- 
> Statistics & Software Consulting
> GKX Group, GKX Associates Inc.
> tel: 1-877-GKX-GROUP
> email: ggrothendieck at gmail.com
> 
> ______________________________________________
> 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.
> 


Thanks Gabor. Much appreciated.

--
View this message in context: http://r.789695.n4.nabble.com/zoo-column-names-tp3553939p3554049.html
Sent from the R help mailing list archive at Nabble.com.