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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/>.
`str.xts` <-
function(object, ..., ncols = 5)
{
is.data.empty <- is.null(dim(object)) || sum(dim(object)) == 0
is.zero.index <- (length(.index(object)) == 0)
nr <- NROW(object)
nc <- ifelse(is.data.empty, 0, NCOL(object))
# "zero-length" xts
# * index length == 0, but tclass and tzone are set
# * NROW == 0
# * NCOL > 0 and may have column names
# examples:
# str(.xts(1, 1)["1900"])
# str(.xts(cbind(a = 1, b = 2), 1)["1900"])
is.zero.length <- (is.zero.index && nr == 0 && !is.data.empty)
# "zero-width" xts
# * index length > 0
# * NROW == 0
# * NCOL == 0
# example:
# str(.xts(, 1:5))
is.zero.width <- (!is.zero.index && is.data.empty)
# "empty" xts
# * index length == 0, but tclass and tzone are set
# * NROW == 0
# * NCOL == 0
# example:
# str(.xts(, numeric(0)))
# str(.xts(matrix()[0,0], numeric(0)))
is.empty <- (is.zero.index && is.data.empty)
if (is.empty) {
header <- "An empty xts object"
} else if (is.zero.length) {
header <- "A zero-length xts object"
} else {
# zero-width and regular xts objects
if (is.zero.width) {
header <- "A zero-width xts object on"
} else {
header <- "An xts object on"
}
time.range <- sub("/", " / ", .makeISO8601(object), fixed = TRUE)
header <- paste(header, time.range, "containing:")
}
cat(header, "\n")
# Data
cat(sprintf(" Data: %s [%d, %d]\n",
storage.mode(object), nr, nc))
# Column names
cnames <- colnames(object)
if (!is.null(cnames)) {
if (nc > ncols) {
more <- nc - ncols
cname.str <- sprintf("%s ... with %d more %s",
paste(cnames[seq_len(ncols)], collapse = ", "),
more,
ifelse(more > 1, "columns", "column"))
} else {
cname.str <- paste(colnames(object), collapse = ", ")
}
cat(sprintf(" Columns: %s\n", cname.str))
}
# Index
cat(sprintf(" Index: %s [%d] (TZ: \"%s\")\n",
paste(tclass(object), collapse = ","),
length(.index(object)),
tzone(object)))
if (!is.null(CLASS(object))) {
cat(sprintf(" Original class: '%s'\n", CLASS(object)))
}
xts.attr <- xtsAttributes(object)
if (!is.null(xts.attr)) {
cat(" xts Attributes:\n")
str(xts.attr, ..., comp.str = " $ ", no.list = TRUE)
}
invisible(NULL)
}
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