Time Parameters of a Time Series Object
DESCRIPTION:
Returns or sets the attribute describing the time domain of a time series.
USAGE: 
tspar(x)
tspar(x) <- value
REQUIRED ARGUMENTS:
x:
a univariate or multivariate time series that is of class "rts", "cts", or "its".
VALUE:
the tspar attribute of x. For regular time series, the tspar attribute is a vector of length three giving the starting time (start), the time interval (deltat) between observations, and the frequency of the observations (frequency). For calendar time series, the tspar is a list of length four giving the starting time (start), the units (units) of the interval between observations, a multiplier (k.units) for the case when there are more than one units of time between observations, and the number of observations in a sampling cycle (frequency). For an irregular time series, the tspar attribute is a numeric vector or vector of dates giving the sampling times for all observations.

The tspar attribute of a regular (rts) or irregular (its) time series may itself have an attribute "units" giving the units in which the interval between observations is measured. The tspar function returns this attribute if it exists.

DETAILS:
To delete the tspar attribute of a time series object x, set its value explicitly to NULL : tspar(x) <- NULL.

The tspar function is generic, although it currently has no methods defined for it. The tspar<- function is generic, and will check correctness if x belongs to one of the time series classes.

SEE ALSO:
rts , cts , its , start , end , deltat , frequency , units , time .
EXAMPLES: 
x <- rts( as.factor(letters), start = c(0,5), freq = 7, units = "weeks")
tspar(x)
tspar(x) <- c( start = 1, deltat = 1/7, frequency = 7)