How to draw frequency domain plot with xts time series data

Hello,


I'd like to convert the below time-series data with fft or wavelet related function and plot it.
Could you let me know
1. How to convert xts data frame format to list format ?
2. How to plot fft or wavelet diagram ?


Here is the data :



> class(zc)
[1] "xts" "zoo"


> str(zc)
An ?xts? object from (10/15/12 09:00:00) to (10/15/12 15:15:00) containing:
  Data: num [1:366, 1] 252 253 253 253 253 ...
 - attr(*, "dimnames")=List of 2
  ..$ : NULL
  ..$ : chr "Close"
  Indexed by objects of class: [chron,dates,times] TZ:
  xts Attributes:
List of 2
 $ tclass: chr [1:3] "chron" "dates" "times"
 $ tzone : chr ""



head(zc)

> head(zc)
                     Close
(10/15/12 09:00:00) 252.40
(10/15/12 09:01:00) 253.10
(10/15/12 09:02:00) 253.15
(10/15/12 09:03:00) 253.30
(10/15/12 09:04:00) 253.25
(10/15/12 09:05:00) 253.45


Thanks in advance,
SK Park




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