# PCICt These functions convert between PCICt objects and other types of data. ```r ## S3 method for class 'PCICt' as(x, cal, ...) .PCICt(x, cal) ## S3 method for class 'numeric' as.PCICt(x, cal, origin, ...) ## Default S3 method: as.PCICt(x, cal, format, ...) ## S3 method for class 'POSIXlt' as.PCICt(x, cal, ...) ## S3 method for class 'POSIXct' as.PCICt(x, cal, ...) ## S3 method for class 'PCICt' as.POSIXct(x, tz="", ...) ## S3 method for class 'PCICt' as.POSIXlt(x, tz="", ...) ## S3 method for class 'PCICt' as.character(x, ...) ``` ## Arguments - `x`: the input data. - `cal`: the calendar type. - `origin`: the origin for a numeric time. - `tz`: the time zone to put the data in. - `format`: the format to parse the date using. - `...`: any additional arguments passed on. ## Details as.PCICt converts the x argument, where x is of type POSIXlt, POSIXct, or character, to a PCICt object with the given calendar type. Calendar types include 360 day calendars("360_day", "360"), 365 day calendars ("365_day", "365", "noleap"), and Gregorian calendars ("gregorian", "proleptic_gregorian"). When converting a character object, one can also specify the format with fmt=, which uses a format documented in the help page for strptime. .PCICt converts numeric objects into PCICt objects, using x as seconds since 1970-01-01 and applying the supplied calendar to the data. as.PCICt.numeric converts numeric objects into PCICt objects, using `x` as seconds since the origin. `origin` can be either a character or a PCICt object. as.POSIXct.PCICt and as.POSIXlt.PCICt convert PCICt objects into POSIXct or POSIXlt objects, respectively. With POSIXct objects, this may result in apparent gaps in the timeseries, and the transformation will not be trivially reversible. See the example below for how to transition between PCICt and POSIXct. as.character.PCICt converts a PCICt object to a character string representation of that object. as.PCICt.default, as.PCICt.POSIXct, and as.PCICt.POSIXlt are helpers which are called by as.PCICt. Normally you will not need to call them directly. ## Returns For as.PCICt and .PCICt, a PCICt object with the given calendar type. For as.POSIXct.PCICt and as.POSIXlt.PCICt, a POSIXct or POSIXlt object, respectively. ## Examples ```r ## Convert these strings to PCICt objects. x <- as.PCICt(c("1961-09-02", "1963-02-01"), cal="360_day") ## Convert these strings to POSIXlt objects, then coerce them into PCICt objects. y <- as.POSIXlt(c("1961-09-02", "1963-02-01")) x <- as.PCICt(y, cal="360_day") ## Convert a string to PCICt using a format string. q <- as.PCICt("03292001", cal="365_day", format="%m%d%Y") ## This will cause a parsing error. ## Not run: bad.r <- as.PCICt("moo", cal="365_day") ## Convert a POSIXct to PCICt 360-day foo <- as.POSIXct("2011-04-01") bar <- as.PCICt(as.character(foo), cal="360_day") ## Test whether the result is the same baz <- as.PCICt("2011-04-01", cal="360_day") bar == baz ## Convert a sequence of days plus an origin to PCICt (as seen in NetCDF files) cal <- "365_day" origin <- "1968-01-01" seconds.per.day <- 86400 ts.dat.days <- 0:100 origin.pcict <- as.PCICt(origin, cal) ts.dat.pcict <- origin.pcict + (ts.dat.days * seconds.per.day) ``` ## See Also `as.POSIXlt`, `as.POSIXct`, `strptime`

as.PCICt function