Gabor Grothendieck wrote:
>
> On Thu, May 26, 2011 at 7:35 PM, Pete Brecknock
> <peter.breckn...@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
>
> ______________________________________________
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>
Thanks Gabor. Much appreciated.
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