Starting and ending time indexes
Return the start or end time index for a tis object.
## S3 method for class 'tis' start(x, ...) ## S3 method for class 'tis' end(x, ...) start(x) <- value
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start.tis returns the start attribute of x, while
end.tis returns start(x) + nobs(x) - 1.
start(x) <- value returns the series x shifted such that
it's starting time is value.
start and end are generic functions with default methods
that assume x has (or can be given) a tsp attribute.
The default methods return a two vector as c(year, period), while the
methods described here return infinitely more useful ti objects.
x <- tis(numeric(8), start = c(2001, 1), freq = 4) start(x) ## --> ti object representing 2001Q1 start(as.ts(x)) ## --> c(2001, 1)
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