###--- >>> `ts' <<<----- Time-Series Objects

	## alias	 help(ts)
	## alias	 help(as.ts)
	## alias	 help(is.ts)
	## alias	 help(print.ts)
	## alias	 help(plot.ts)
	## alias	 help(plot.mts)
	## alias	 help(lines.ts)

##___ Examples ___:

ts(1:10, frequency = 4, start = c(1959, 2)) # 2nd Quarter of 1959
print( ts(1:10, freq = 7, start = c(12, 2)), calendar = TRUE) # print.ts(.)
## Using July 1954 as start date:
gnp <- ts(cumsum(1 + round(rnorm(100), 2)),
          start = c(1954, 7), frequency = 12)
plot(gnp) # using `plot.ts' for time-series plot

## Multivariate
z <- ts(matrix(rnorm(300), 100, 3), start=c(1961, 1), frequency=12)
plot(z)
plot(z, plot.type="single", lty=1:3)

# Ensure working arithmetic for `ts' objects :
stopifnot(z == z)
stopifnot(z-z == 0)


 ts(1:5, start=2, end=4) # truncate
 ts(1:5, start=3, end=17)# repeat

## A phase plot:
data(nhtemp)
plot(nhtemp, c(nhtemp[-1], NA), cex = .8, col="blue",
     main = "Lag plot of New Haven temperatures")
## a clearer way to do this would be
##Don't run: library(ts)
##D plot(nhtemp, lag(nhtemp, 1), cex = .8, col="blue",
##D      main = "Lag plot of New Haven temperatures")

## Keywords: 'ts'.


