[R-SIG-Finance] Most common way to add derived columns to an XTS object?

[Joshua Ulrich]

You already asked and received an answer for this question.  I also
answered you when you asked me this question off-list.  Please don't
post duplicate questions, especially when they were answered only days
ago!

As Jeff Ryan said, use merge.xts.  See ?merge.xts.

x <- .xts(1:10,1:10)
y <- merge(x,d=diff(x))

As I said, use "$<-".  See ?"$".
y$r <- rnorm(NROW(y))

Do some work.  No one is going to spoon feed you.

--
Joshua Ulrich
FOSS Trading: www.fosstrading.com



On Wed, Mar 10, 2010 at 7:52 AM, Robert Nicholson
<robert.nicholson at gmail.com> wrote:
> So you have data in your XTS object and all I'm trying to do is add columns (attributes) that are derived values.
>
> does anybody have an example of this?
>
> I'm trying to perform a simply transformation on an existing attribute in my XTS object and store the value as a new attribute.
>
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