stats (version 3.3.2)

tsp: Tsp Attribute of Time-Series-like Objects

Description

tsp returns the tsp attribute (or NULL). It is included for compatibility with S version 2. tsp<- sets the tsp attribute. hasTsp ensures x has a tsp attribute, by adding one if needed.

Usage

tsp(x)
tsp(x) <- value
hasTsp(x)

Arguments

x

a vector or matrix or univariate or multivariate time-series.

value

a numeric vector of length 3 or NULL.

Value

An object which differs from x only in the tsp attribute (unless NULL is assigned). hasTsp adds, if needed, an attribute with a start time and frequency of 1 and end time NROW(x).

Details

The tsp attribute gives the start time in time units, the end time and the frequency (the number of observations per unit of time, e.g. 12 for a monthly series). Assignments are checked for consistency. Assigning NULL which removes the tsp attribute and any "ts" (or "mts") class of x.

References

Becker, R. A., Chambers, J. M. and Wilks, A. R. (1988) The New S Language. Wadsworth & Brooks/Cole.

See Also

ts, time, start.