timetools (version 1.5.2)

timetools-package: provides objects and tools to manipulate irregular heterogeneous time data and subtime data.

Description

This package is intended to manipulate irregular time series such as subtime series, series based on time intervals, heterogeneous time series (hourly time series and monthly time series at the same time for instance), etc.

This package uses (and extends) only POSIXt* format for time objects.

Main things defined in this package are :

1. the classes POSIXcti (astime intervals), POSIXctp (astime periods) and subtime (days of week, weeks of year, months of year, etc.), to deal with basic time concepts ;
2. TimeIntervalDataFrame, TimeInstantDataFrame and SubtimeDataFrame to deal with time series (regular, homogeneous,irregular, heterogeneous or whatever) ;
3. methods to switch from one class to another ;
4. and thechangeSupportmethod for TimeIntervalDataFrame (cfchangeSupportfor more details).

Details

ll{ Package: timetools Type: Package Version: 1.5.2 Date: 2013-05-05 Depends: methods License: GPL LazyLoad: yes URL: http://sourceforge.net/projects/timetools/ Encoding: UTF-8 }

See Also

TimeInstantDataFrame, TimeIntervalDataFrame, changeSupport, SubtimeDataFrame, POSIXcti, POSIXctp

Examples

ti1 <- TimeIntervalDataFrame (
	c('2010-01-01', '2010-02-01'), c('2010-02-01', '2010-02-02'),
	'UTC', data.frame(ex1=1:2) )

ti2 <- TimeIntervalDataFrame (
	c('2010-01-01', '2010-02-01', '2010-02-02'), NULL,
	'UTC', data.frame(ex1=1:2) )

all.equal (ti1, ti2)

ti3 <- TimeIntervalDataFrame (
	c('2010-01-01', '2010-01-02', '2010-01-04'), NULL,
	'UTC', data.frame(ex3=c(6, 1.5)))

# weighted mean over a period of 3 days with at least 75% of
# coverage (NA is retunr if not)
ti3
d <- POSIXctp(unit='day')
changeSupport (ti3, 3L*d, 0.75)


ti4 <- TimeIntervalDataFrame (
	c('2010-01-01', '2010-01-02', '2010-01-04', 
	  '2010-01-07', '2010-01-09', '2010-01-10'), NULL,
	'UTC', data.frame(ex4=c(6, 1.5, 5, 3, NA)))

# weighted mean over a period of 3 days with at least 75% of
# coverage (NA is retunr if not) or 50%
ti4
changeSupport (ti4, 3L*d, 0.75)
changeSupport (ti4, 3L*d, 0.5)