[R-SIG-Finance] Question on zoo time series

Gabor Grothendieck ggrothendieck at gmail.com
Mon Jan 31 19:21:27 CET 2011

On Mon, Jan 31, 2011 at 12:51 PM, Megh Dal <megh700004 at gmail.com> wrote:
> Hi, let say, I have following execution:
>  > library(zoo)
>> library(quantmod)
>> PriceDat <- as.zoo(get(getSymbols("APL"))[,4])
>> is.numeric(PriceDat)
> [1] TRUE
>> PriceDat <- zoo(data.frame(Price=coredata(PriceDat), Others="APL"),
> index(PriceDat))
>> is.numeric(PriceDat$Price)
> [1] FALSE
> Here surpricingly, once I create a data-frame I see that "Price"
> observations become non-numeric. Can someone please explain this, why it is
> so? Shouldn't I expect it will remain Numeric?

What you have actually done is create a data frame in which one column
is c("APL", "APL", ..., "APL") and then tried to convert that to zoo.

What you intended was likely:

merge(PriceDat, APL)

Statistics & Software Consulting
GKX Group, GKX Associates Inc.
tel: 1-877-GKX-GROUP
email: ggrothendieck at gmail.com

More information about the R-SIG-Finance mailing list