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# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library 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 Library General Public License for more details.
#
# You should have received a copy of the GNU Library General
# Public License along with this library; if not, write to the
# Free Foundation, Inc., 59 Temple Place, Suite 330, Boston,
# MA 02111-1307 USA
# Copyrights (C)
# for this R-port:
# 1999 - Diethelm Wuertz, GPL
# 2007 - Rmetrics Foundation, GPL
# Diethelm Wuertz <wuertz@phys.ethz.ch>
# www.rmetrics.org
# for the code accessed (or partly included) from other R-ports:
# see R's copyright and license files
# for the code accessed (or partly included) from contributed R-ports
# and other sources
# see Rmetrics's copyright file
################################################################################
# MEHODS: DESCRIPTION:
# Ops.timeDate Group 'Ops' operations on 'timeDate' objects
# +.timeDate Performs + operation on 'timeDate' objects
# -.timeDate Performs - operation on 'timeDate' objects
################################################################################
Ops.timeDate <-
function(e1, e2)
{
# A function implemented by Diethelm Wuertz
# Description:
# Uses group 'Ops' generic functions for 'timeDate' objects
# Arguments:
# e1 - an object of class 'timeDate'
# e2 - an object of class 'timeDate'
# Value:
# Returns the 'Ops' grouped object.
# FUNCTION:
# Set Timezone to GMT:
myTZ = Sys.getenv("TZ")
Sys.setenv(TZ = "GMT")
on.exit(Sys.setenv(TZ = myTZ))
# Check Logical Operators:
if (nargs() == 1)
stop(paste("unary", .Generic, "not defined for timeDate objects"))
boolean <- switch(.Generic, "<" = , ">" = , "==" = ,
"!=" = , "<=" = , ">=" = TRUE, FALSE)
if (!boolean)
stop(paste(.Generic, "not defined for timeDate XXX objects"))
# Convert to GMT:
e1GMT = timeDate(e1, zone = e1@FinCenter, FinCenter = "GMT")@Data
e2GMT = timeDate(e2, zone = e2@FinCenter, FinCenter = "GMT")@Data
# Convert to Julian:
if (inherits(e1GMT, "POSIXct")) e1 <- as.POSIXct(e1GMT)
if (inherits(e2GMT, "POSIXct")) e2 <- as.POSIXct(e2GMT)
# Return Value:
NextMethod(.Generic)
}
# ------------------------------------------------------------------------------
"+.timeDate" <-
function(e1, e2)
{
# A function implemented by Diethelm Wuertz
# Description:
# Performs arithmetic "+" operation on 'timeDate' objects.
# Arguments:
# e1 - an object of class 'timeDate'
# e2 - an object of class 'numeric'
# Value:
# Returns a 'timeDate' object "e2" seconds later than the
# 'timeDate' object "e1".
# FUNCTION:
# Set Timezone to GMT:
myTZ = Sys.getenv("TZ")
Sys.setenv(TZ = "GMT")
on.exit(Sys.setenv(TZ = myTZ))
# Check Class Types:
test1 = test2 = 1
if (inherits(e1, "timeDate")) test1 = 0
if (inherits(e2, "numeric")) test2 = 0
if (test1 + test2 != 0) stop("Wrong class types")
# Convert to GMT:
e1GMT = timeDate(e1, zone = e1@FinCenter, FinCenter = "GMT")@Data
# Add and Convert back to FinCenter:
ans = timeDate(e1GMT+e2, zone = "GMT", FinCenter = e1@FinCenter)
# Return Value:
ans
}
# ------------------------------------------------------------------------------
"-.timeDate" <-
function(e1, e2)
{
# A function implemented by Diethelm Wuertz
# Description:
# Performs arithmetic "-" operation on 'timeDate' objects
# Arguments:
# e1 - an object of class 'timeDate'
# e2 - an object of class 'timeDate' or of class 'numeric'
# Value:
# Returns a 'difftime' object if both "e1" and "e2" are
# 'timeDate' objects, or returns a 'timeDate' object "e2"
# seconds earlier than "e1".
# Example:
# charvec = c("2004-01-01 16:00:00", "2004-01-01 18:00:00")
# x = timeDate(charvec, zone = "GMT", FinCenter = "Europe/Zurich")
# FUNCTION:
## Set Timezone to GMT:
myTZ = Sys.getenv("TZ")
Sys.setenv(TZ = "GMT")
on.exit(Sys.setenv(TZ = myTZ))
# Check Class Types:
test1 = test2 = 1
if (inherits(e1, "timeDate")) test1 = 0
if (inherits(e2, "timeDate")) test2 = 0
if (inherits(e2, "numeric")) test2 = 0
if (test1 + test2 != 0) stop("Wrong class types")
# First Object:
e1GMT = timeDate(e1, zone = e1@FinCenter, FinCenter = "GMT")@Data
if (inherits(e2, "timeDate")) {
e2 = timeDate(e2, zone = e2@FinCenter, FinCenter = "GMT")@Data
# Returns difftime:
return(e1GMT-e2) }
if (inherits(e2, "numeric")) {
# Returns timeDate:
return(timeDate(e1GMT-e2, zone = "GMT", FinCenter = e1@FinCenter)) }
# Return Value:
invisible()
}
################################################################################
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