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#
# xts: eXtensible time-series
#
# Copyright (C) 2008 Jeffrey A. Ryan jeff.a.ryan @ gmail.com
#
# Contributions from Joshua M. Ulrich
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#' Coerce an xts Object to an Environment by Column
#'
#' Method to automatically convert an xts object to an environment containing
#' vectors representing each column of the original xts object. The name of
#' each object in the resulting environment corresponds to the name of the
#' column of the xts object.
#'
#' @param x An xts object.
#'
#' @return An environment containing `ncol(x)` vectors extracted by
#' column from `x`.
#'
#' @note Environments do not preserve (or have knowledge) of column order and
#' cannot be subset by an integer index.
#'
#' @author Jeffrey A. Ryan
#'
#' @keywords manip
#' @examples
#'
#' x <- xts(1:10, Sys.Date()+1:10)
#' colnames(x) <- "X"
#' y <- xts(1:10, Sys.Date()+1:10)
#' colnames(x) <- "Y"
#' xy <- cbind(x,y)
#' colnames(xy)
#' e <- as.environment(xy) # currently using xts-style positive k
#' ls(xy)
#' ls.str(xy)
#'
as.environment.xts <- function(x) {
e <- new.env()
lapply(1:NCOL(x), function(.) assign(colnames(x)[.], x[,.],envir=e))
e
}
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